I've worn them for years. Unless he's nearly deaf, there's no way he needs electronic ears that expensive.
Do NOT buy from some online seller or eBay. He needs to shop around, find a good audiologist and get his hearing tested and some recommendations. The audiologist will also sell them, but that doesn't mean he has to buy them there.
Costco sells aids, complete with an audiologist available and I imagine Wally World does too.
Assuming he just has normal hearing loss from age, he can probably get what he needs for $1,000 to $2,000 per aid. The main thing is finding a good audiologist not one whose main function is selling aids. If he lives in a small town, take him on a shopping trip someplace urban.
Also, tell him it's worth it.