I have a Moultrie Digital GamySpy 100 (or something to that effect) that's available at wal-mart for under $100 or online for about the same. It only needs a 6V batter (I'd suggest a rechargable one) and last fora couple weeks on that. You can use up to a 256 KB. It takes some pretty good quality pictures (1.3 MP) and I've been very satisfied.

Just my opinion, of course, but I think these are every bit as good as the other digital cameras at a fraction of thecost!