The basic, short barrel model is going for $250ish new.
I've seen 'em as low as $150 in pawn shops--and they sell QUICK at that price.
More common is $200-225...depending on condition and extras. Rimfire pistols sell quick anyway, but these P22's seem to fly off the shelves.
Never understood it, personally...very small, not too accurate, they eject brass in any direction but the one you want, and they have a tendency to crack the slide.