if you want to do some more research, here's something I found online that helps with the buying process, whether it's costco or not. Good luck!
Consumer Guide to Hearing Aids | Huston Hearing
I like them but costco's not for everyone
I've purchased hearing aids from Costco. It's a great buy! I was thinking heavily about price though and i didn't care as much about the newest stuff. I paid around $2800 for mine.
The only issue with Costco is that the hearing aids are older...