SWFA (riflescopes.com) has good prices on most everything they carry. I got a Nikon Monarch 3-9x40 from them a few months ago for $199. Also Midway (midwayusa.com) has good sales from time to time.
The Nikon Monarh scopes are good to great and good value IMHO. I shoot mostly Mark 4 Leupolds, but wanted to try something less expensive for a hunting rifle. Seems fine so far. I have hears good things about the Nikon Buckmark scopes too.
What in particular are you needs? (Big game hunting, varmints, target shooting, handgun scope, etc?) And what ranges will you be shooting?