The Crosman P312 is a spring pistol with no blowback. Crosman just says repeater to make it sound cool. Its a larger than average size pistol and comes with a mock silencer/barrel extension. I live in Calgary and have seen them at Canadian Tire for about $35.
Heres a link:
http://www.canadiantire.ca/AST/brows...t%2BPistol.jsp