In the current insane market everyone seems to be looking to cash in. Nice pistol, but unless it comes with something like 20 mags $750 seems way to high. IMO, I think the $400-550 range is likely fair market assuming you get at least 2-3 mags.
Heck, it seems most new .22's; be it Ruger's, Brownings, Walthers, etc... that I've been seeing at dealers seem to fall in that $400-550 price range.