My dad bought hearing aids that cost like £2000 (private, UK). The market here is kind of split between fairly mundane ones you can buy in shops for £100 or so (or free on the NHS) and fancy ones you get prescribed by an audiologist with computer sound processing that are more like £2000.
My dad's never actually cracked his biggest problem which was if you are at a table with many people talking, picking out one conversation. It looks like the coming Apple AI may actually be able to do that. It's a hard problem technically.
Actually, it isn't that hard a problem technically, you just need a directional mic. I'm deaf, I have NHS issued equipment, and I have a specific setting that makes the mics more directional. Additionally (slightly off topic for the reply, but perhaps of interest) I also have the option of using a discreet wireless mic about the size of a pencap that I can give to presenters or pass round the table. Again, NHS issued, for which I'm very grateful.