In case you reconsider Costco, just want to add some input. I got my most recent hearing aid at the one in Wilmington, NC, and they have a hearing aid specialist on staff daily in an office next to the eyeglasses.
This was my fourth aid since 1998, all the previous ones fitted by an audiologist (3 different ones, as I moved locations). No problem getting just the one aid, as I am profoundly deaf in worst ear, so not helped by one. Severe loss in the other.
This one at Costco was HALF the cost, for the same type of H aid, and the fitting was just as professional. $1200 versus $2400. Certainly covered a year's membership and gas to drive an hour further to Costco. And they provide free batteries whenever needed.
This bore out what Consumer Reports Magazine determined when they had 100 people go shopping for HAs. I heard a presentation about this at the Hearing Loss Assoc of America's national conference in 2011. Prices vary greatly and people can shop around and still get good results, and an audiologist is not necessarily the best choice.