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.