I have a couple TACTACAM gen 2's and gen 3's. I've been happy with them. About $120 for the camera. $20 for SD card. $25-50 for a rechargable lithium battery (Or 12 AA batteries that last a couple months). You can also buy a tether cord, LIPO motorcycle battery, and ammo can, and plug in a supplemental batter that will last 6+ months per charge.
After the initial cost of about $200 to get a cam set up. I pay about $10 per month for the unlimited photo plan(per camera). Cell runs on AT&T or Verizon network, whichever gets stronger signal.
For an additional $10 per month, you can upgrade service (applies to all cameras on your account)to allow you to request HD photos sent to your phone, video sent to your phone, and you can remotely trigger on-demand photos/video. These cameras have adjustable sensitivity. Also you can set them to only be active at certain times of day. So if you get a lot of false shadow photos during the middle of the day, you can set it to go inactive during that part of the day.