But the technical leap is not the only reason for high prices. Traditionally, hearing aids have been sold through professionals who also fit and adjust the devices as part of the overall cost. The system, however, leaves room for plenty of inept or even greedy providers to take the reins.

That’s why choosing an audiologist or hearing aid technician can be just as important as choosing the aid itself. What follows is advice on how to do just that  as well for finding financial help when purchasing hearing aids.

SHOP FOR THE PROVIDER. No matter how state of the art your hearing aid may be, Ms. Hamlin says, if it is not properly programmed and adjusted it will not do you any good.

Ms. Kasewurm, the audiologist, says two people with the same degree of hearing loss will process sound differently depending on the cause of the hearing diminishment and how long the problem has gone untreated. That makes it difficult to buy the right hearing aid over the counter or through the Internet.

Most hearing aids are sold by an audiologist or a hearing instrument specialist. Audiologists have a doctorate, but not a medical degree, while instrument specialists go through a training program and an apprenticeship. Sometimes a hearing aid center will employ both types of professionals. Your ear, nose and throat medical specialist may have an audiologist on staff who will dispense hearing aids.

The Hearing Loss Association of America provides a good checklist for anyone purchasing a hearing aid and looking for a good dispenser. In addition, the American Academy of Audiologists lists providers by locale.

WHAT TO ASK BEFORE YOU BUY.

¶Do you sell a wide range of products?

Your dispenser should sell every style of hearing aid, including behind-the-ear open fit, behind-the-ear with ear mold, inside the ear and inside the ear canal. That way you will have a better chance of finding the type that works best and is most comfortable for you.