Wal Mart sells a Gamo Shadow series. It is single pump, breakdown. It fires at 1000 feet per second. Thats close to a 22 rifle. The drawback is that it's only 177 cal.
I have this one.
http://www.gamo-airguns.com/air-rifle-huntersilvershadow890.htm
The shadow 1000 cost around 150 bucks without the scope, Cabellas has them also.
Most of the multi pump guns only fire around 600-750 fps.
co2 is down around 500 or so