You can likely find several good scopes in the neighborhood of $100. In addition to Bushnell, you might also want to check out Weaver. Here's some links that might help:
SWFA: http://www.riflescopes.com/store/default.asp

Midway: http://www.midwayusa.com/

Optic Zone: http://www.theopticzone.com/

Found this at SWFA:

Weaver 2.5-7x28 Classic Rimfire Rifle Scope
SWFA: $129.95
[ul][*]Silver[*]Dual-X[*]1" [/ul]





Bushnell 3-9x32 .22 Rimfire Scope

[ul][*]Silver[*]Multi-X[*]1"[*]Free 3/8" Rings [/ul]
SWFA:
$39.95[/b]