Welcome to the addiction. If you don't know what I mean by that statement, you soon will. Obviously in the $100 range, your choices for a good quality camera are a little limited but can still be done. In that range the new Moultrie D-55, Stealthcam I-590, or the Spypoint FL-A would be a good choice. Great places to read reviews and buy from are
www.trailcampro.com and
www.chasingame.com. Good luck with whatever you get and we will be looking forward to your pics.
Blessings.....Pastorjim