Sorry - but our just looking at one side of the coin. Suggest you read the following and then seriously re-think your position.
Here’s a brief list of the things that you should consider before buying your hearing aids on eBay:
Hygiene - Perhaps the single reason why you should not buy a pair of 2nd hand hearing aids is that you have no idea what kind of health issues the previous owner has had. Hearing aids are personal medical devices and contagious diseases can easily transfer from one person to another through the use of hearing aids.
Experienced users - Buying second-hand hearing aids for first-time users of hearing aids are not recommended. Even experienced HA users. Consult a local audiologist before buying any hearing aids especially if you are a first-time user of hearing aids. Your hearing loss may be pathological or may be a referable case that requires further investigation.
Suitability - Consultation with your audiologist could ensure that the hearing aids that you plan to buy online covers the range of your hearing loss. Also, other elements of the hearing aid for example the length of the receiver in RIC models is long enough and fits well on your ears.
Local or online support - Make sure that you have access to a local audiologist. Remember that it is extremely unlikely that the hearing aids purchased on eBay have any warranty left on them. And by chance if they do, you will have to get an Audi to assist you to transfer over the registration and any warranty left on the hearing aids to you by the manufacturer. But most Audi’s if not all, don’t want to get involved with used hearing aids because (1) there used and (2) a professional Audi would steer a HA user to new hearing aids.
Age of hearing aids - The life of hearing aid depends on the quality of the build and the way they have been treated. Buying a HA older than 3 years old is not wise and of course “why is the hearing aid” being sold in the first place. Did the dog try to eat it?
Technology level - The price of hearing aids varies based on their technology level. Make sure you consult with an AuD or search online to understand the technology and sound processing level of the hearing aids you might think to purchase on eBay.
Faulty hearing aids - There is a risk that the hearing aid that you buy on eBay is faulty or has had a history of intermittent problems. Make sure that you share the concern with the seller and leave the option to return them after a period from purchase if they didn’t work well. Again having access to a local AuD would help manage unexpected events.
Notice all of the above mentions Audiologists. Like “Warning - eBay doesn’t employ Audiologists”.
Enough said - moving on.