Cheap is a relative term, but I can recommend the Remington Genesis, and that deal at Cabelas for the camo/blue version gets you the gun for less than $100 after the $35 MFR rebate and Cabelas $20 off.

Put a decent scope on it and you'll have less than 300 in the gun, including powder and projectiles to get rolling.

I shoot the Hornady FPB and even though it is a relatively heavy bullet at 350 gr., with 120 gr Pyrodex, sighted 2.75" high at 75 it is a 150 yard load (3.5" low). If that's the kind of range you need, I can't see how you'd go wrong with that setup.