Define "cheap". I bought a Cuddeback several years ago for around $120 (Cabela's,com). This particular model uses not use a flash at night time and provides pretty good image quality, even at night. It uses batteries up pretty quickly, though. I think it's 6 D cells will last 6 weeks on a heavily used trail. That might change your calculus.
I started using trail cams 7 years ago and its a real eye opener what you'll find. I think they should have a heading for sharing your favorite trail cam photos on this forum. Have fun.
