Here are the choices that I know of.
Smart Scouter...About $600.00 Lousy pictures
Scoutguard SG580...About $350.00 Poor reviews on chasingame.com
Moultrie Game Management System...About $400.00 Monthly service is $90.00 per month Probably has the best pics of this group.
Penns Woods Cellular-Scout...About $600 Had one of the first transmitting cameras. Not sure if they are still in business.
Buckeyecam...About $1800-$2400 The Cadilac of these types of cameras but you definately pay for it
Hope this helps.
Blessings.....Pastorjim