It all depends on the quality, IMO. I would tend to think it is on the 'expensive' side, but if that is a show male (not just size, but appearance), then maybe not. Don't just get it because it is a large Dovii.
I bought the dominant breeding pair (the nicest ones too) from my LFS for $60 CAD. Male is about 8" or so, female an inch smaller. Definitely WAY smaller fish, but it was a pair, and they are easier to mix at that size.
Good luck whatever you decide, but if you are paying $100, just make sure it is a QUALITY SHOW MALE!! If he is tattered/scarred or just the slightest bit 'odd' looking, I wouldn't, not for that much, and probably not at all.