Ah, bless your dd, what a sweetie to swim, I'm a doggie paddler anymore.
I did a little reading to see why my sisters were a few hundred; she had amplifiers. The new models are digital and can range from $1,000 to $6,000.
My worry with her was a past experience I had with a tens unit. A supplier came to the doctors office with a free two week trial. He showed me how to use it, and then contacted me if I wanted to keep it. The cost was $150.00, but recently I went online to replace the same model and it was $53 with free shipping and 10% discount.
That's a big mark up. In her case, it is not the doctor, but someone that comes to the office twice a week.
She believes if she doesn't get it she will get senility set in. My concern, she sometimes has diminished hearing, but we converse, speak on the phone, order meals, I didn't detect any profound problem.
I don't want her taken advantage of.