Buy a CPAP Machine Under $300: The One Proven Option in Stock
Direct answer: Yes — one proven machine sells under $300 in the US: a certified refurbished ResMed S9 AutoSet with heated humidifier at $249.99 from MyRespCo. Everything cheaper is a used marketplace listing with no warranty, no inspection, and no prescription check, or a no-name import. Add the Universal Fit Full Face Mask Kit at $39.99 and the all-in total is $289.98 — still under $300. A prescription is required.
Prices: what $300 actually buys
| Option | Price | Where | Verdict |
|---|---|---|---|
| Refurbished ResMed S9 AutoSet with H5i humidifier | $249.99 | MyRespCo, in stock | The one proven option under $300 — RT-inspected, 1-year warranty, 30-day returns |
| Used Respironics RemStar auto CPAP | $184 CAD (about $132 US) | Karrot marketplace listing | Used, private seller, no warranty, no inspection, no prescription check |
| Used Philips DreamStation 2 | $350.00 | eBay listing | Over budget, used, no warranty stated |
| Refurbished Philips DreamStation 2 Auto | $629.00 | 1800cpap | Over budget — more than double the S9 |
| Refurbished ResMed AirSense 10 AutoSet | $379.99 | MyRespCo | Over budget, but the next step up |
| Brand new Dream Sleep Auto CPAP combo | $469.99 | MyRespCo | Over budget — the cheapest brand-new complete combo |
| New auto CPAP from a US retailer | $699-$819 | Order Your Supplies | New-machine pricing, far over budget |
The pattern is stark: no US retailer sells a new proven CPAP under $300, and the cheapest certified refurbished machines from the big retailers start at $399 and up. The only machine under $300 with a warranty, an inspection, and a prescription check is the S9 at MyRespCo.
The S9: what you get for $249.99
| Feature | Details |
|---|---|
| Brand | ResMed |
| Model | S9 AutoSet with H5i heated humidifier |
| Condition at MyRespCo | Certified refurbished, RT-inspected |
| Therapy | AutoSet auto-adjusting pressure, 4-20 cmH2O |
| Humidifier | H5i integrated heated humidifier |
| Comfort | EPR (expiratory pressure relief), ramp |
| Noise | Whisper-quiet operation |
| Data | SD card recording — AHI, leak, usage |
| Tubing | Compatible with ClimateLineAir heated tubing |
| Warranty at MyRespCo | 1-year limited warranty |
| Returns at MyRespCo | 30 days from delivery |
| Prescription | Required before shipment |
| Shipping at MyRespCo | Free US standard shipping, ships today |
The S9 is the older generation of the AirSense line, and that is exactly why it is cheap: it has no touchscreen, no Wi-Fi, and no app. What it does have is the same AutoSet therapy algorithm as the newer models, a heated humidifier, and a simple dial interface. For a buyer whose budget is $300, those missing features are the trade, not a defect.
What the cheaper listings really are
A 2016 study in JAMA Internal Medicine found the average secondhand CPAP sold online went for $291 — right in this price range. That is the market this article is about, and the study's warning still applies: a used machine from a private seller has unknown hours, unknown pressure settings, no sanitization, no warranty, and no recourse if it fails on night two. Manufacturer warranties do not transfer — ResMed's warranty applies only to the first buyer — so a privately sold machine carries no warranty at all. And it is illegal in the US to sell a CPAP machine without a prescription, which is why reputable sellers require one and marketplace sellers often do not ask.
The $184 CAD RemStar on Karrot is the honest version of the cheap listing: a private seller, functional but used, throwing in new tubes, no warranty, no inspection. It might work. It might not. There is no way to know before paying, and no one to call if it does not.
The all-in total: machine plus mask under $300
| Item | Price |
|---|---|
| Refurbished ResMed S9 AutoSet with H5i humidifier | $249.99 |
| Universal Fit Full Face Mask Kit | $39.99 |
| Total, machine plus mask | $289.98 |
That total is still under $300, with a warranty on the machine and a mask in the box. Two notes: the Nasal Mask Kit ($49.99) and Nasal Pillow Mask Kit ($49.99) are both sold out at MyRespCo as of November 12, 2026, so the full face kit is the mask to pair with the S9 today. And heated tubing for the S9/AirSense 10 is $49.99, which would push the total over $300 — start with the standard tubing that comes with the machine and add heated tubing later if rainout is a problem.
The 6 checks before you buy a CPAP under $300
- Confirm the prescription is on file. A CPAP machine is a prescription device in the US, at any price. Upload it, email it to rx@myrespco.com, or let MyRespCo request it from your doctor.
- Buy certified refurbished, not used. Refurbished means inspected, sanitized, tested, and warranted. Used means as-is, from a stranger, with no recourse.
- Ask about hours. A refurbished S9 has prior use. MyRespCo inspects, sanitizes, tests, installs a new filter, and clears prior patient data before shipping.
- Check the warranty in writing. MyRespCo's refurbished S9 carries a 1-year limited warranty and 30-day returns. A listing with no warranty is not the same product at a lower price.
- Budget the mask. A machine without a mask treats nothing. The S9 plus the Universal Fit Full Face Mask Kit is $289.98 all-in.
- Check the recall. If the cheap listing is a Philips DreamStation, check the model and serial number against the June 2021 recall before paying — un-remediated original DreamStations are recalled devices.
Ready to order?
- Refurbished ResMed S9 AutoSet, $249.99, in stock: https://myrespco.com/products/refurbished-resmed-s9
- Universal Fit Full Face Mask Kit, $39.99, in stock: https://myrespco.com/products/myrespco-mediumffmask
- Next step up — refurbished ResMed AirSense 10 AutoSet, $379.99: https://myrespco.com/products/refurbished-resmed-s10-autoset-cpap
- Read first: Buy a CPAP Machine Under $400 (the one proven option in stock): https://myrespco.com/blogs/latest-blogs/buy-cpap-machine-under-400
- Read first: Buy a Used CPAP Machine (prices, risks, and the safer way): https://myrespco.com/blogs/latest-blogs/buy-used-cpap-machine
- Read first: Buy a Refurbished Philips DreamStation (recall facts and safer buys): https://myrespco.com/blogs/latest-blogs/buy-refurbished-philips-dreamstation
- Questions? Call or text MyRespCo at 706-772-0263.
Frequently asked questions
Can you really buy a CPAP machine under $300?
Yes — one proven option: a certified refurbished ResMed S9 AutoSet with heated humidifier at $249.99 from MyRespCo. No new proven machine sells under $300 in the US, and the cheapest certified refurbished machines from big retailers start at $399.
Is a $249.99 CPAP machine too good to be true?
No, if it is certified refurbished from a licensed DME. The S9 is an older model — no touchscreen, no Wi-Fi, no app — and that is why it is cheap. It still delivers the same AutoSet therapy algorithm as newer ResMed machines, with a warranty and returns.
What is the cheapest CPAP machine I can buy?
Used marketplace listings go lower — a used RemStar was listed at $184 CAD — but those have no warranty, no inspection, and no prescription check. The cheapest safe buy is the refurbished S9 at $249.99.
Do I need a mask too, and does that break the $300 budget?
Yes, you need a mask, and no — the S9 at $249.99 plus the Universal Fit Full Face Mask Kit at $39.99 totals $289.98, still under $300.
Do I need a prescription for a CPAP under $300?
Yes. CPAP machines are prescription medical devices in the US at any price. Any seller offering a CPAP with no prescription is a red flag.
What if I can stretch to $400?
The refurbished ResMed AirSense 10 AutoSet at $379.99 is the next step up — newer platform, color display, SmartStart auto on/off, and a built-in heated humidifier. Read the under-$400 guide for the full comparison.
General information only, not medical advice. Whether a buyer needs CPAP, APAP, or BiPAP, which mask type fits, and what pressure settings to use, comes from their prescriber and sleep study, not from a seller or an article.