Football!Magnavox Odyssey 2 North American (NTSC) Games
(good instructions) - $2.98
Each team has five players and eight plays. While this is about as basic as a football game can get (no first downs, one screen, etc) it is at least a little interesting... and pretty hard to find.
NOTE: All photos depict good condition items only; actual product may vary.
Used Football! (poor box, good instructions)
Used Football! (good instructions)