Welcome to the forums, always glad to see new people taking up this very addictive sport. Actually you picked a pretty good time to be buying cameras. Many of the retailers are trying to get rid of last years models because the new ones are almost ready to come out. I think there's a few questions you'll have to ask yourself before you make your purchase. Are they going to be over feeders or on trails. Is the primary purpose just to inventory what's there. Do you want white-flash or IR. If you are going over feeders or water sources, almost any camera will do since you won't have to worry about trigger speed. If you are going on trails then you willl need something with good trigger speed. You say you are checking cameras about two times in three weeks, almost any camera has that good of a battery life. If you are buying 4-6 units at one time, how much are you wanting to spend. The trend in cameras recently has been in getting the cameras smaller and smaller. A few good ones that are really small are the Scoutguards, Bushnells, DLC's, and the Wildgame Innovations X6C. Those are all solid dependable cameras and run anywhere from $120-$175.00. You can go cheaper with any of the Wildviews, Stealthcams, and some of the Moultries....anywhere from $69.00-$120.00. Here are a couple of sites to read reviews and be able to make an informed decision.
www.trailcampro.com and
www.chasingame.com. Hope this helps.
Blessings.....Pastorjim