I have all 4 of them, .22lr, 22wmr, 17hmr, and 44mag.. you dont see them very often, the .22LR and 17HMR seem to be the hardest to find, I try to go to almost every gun show within 125 miles of me and only ever seen 1 of the 17 and 22lr, both of which are the ones that I bought ..
Like everyone else has mentioned they seem to routinely bring 550-900 around here...when you can find one...but like everything else, there are deals out there for less money if your lucky and patient