Free: Contests & Raffles.
I have one but personally wouldn't want to hang around that long at my spot to view the pics in fear if scaring something out of there.
I have a m-100, m-80, and several m-880s. My m-80 and 880's do better on battery life. Some of these guys might not notice a huge difference in battery life, but my cameras take anywhere from 1500-3500 pics a weeks and the m-100 has to be changed out 3-4 times more a year then the 80 series. Just my