Prices are all over the map. If you get a prescript
ion and buy the FDA-approved models, I'd say $500 - $650. My insurance covered most of my cost on that. From what I've seen, insurance does not cover them in a lot of cases.
Several of the guys here have bought various types on the internet or in adult shops for $50-$150. Those won't be covered by insurance, but then you are not expecting them to last forever and have a warranty.