@barbb That is certainly a good consideration. I intend to stay with the audiologist group I now currently go to, but if for some reason that changed I had wondered about Costco. I have a severe loss in one ear, profound in the other, so perhaps it is best for me to continue going to a reputable private audiologist group.
I say reputable because there are some in my area, basically storefront audiologists, who are less so. People I know who have gone to them have not been happy with the results.
Always check the qualifications of the audiologists. There are four where I go and all have doctoral degrees. I think that is required in some states, but not all, or perhaps it's one of those things that is "grandfathered" in and those in practice before doctoral degrees became a requirement were already in practice.
JK