NFL Tour is currently $9.90 for 360 on Amazon which is a pretty solid price, especially if you're Prime. It's not a particularly good game, but at least it's an easy 1000 if you like your gamerscore.
http://www.amazon.com/NFL-Tour-Xbox-360/dp/B000WS7EFO/ref=pd_ts_vg_4?ie=UTF8&s=videogames
I didn't see this low price listed anywhere else.
EDIT: Madden 08 and March Madness 08 are also $9.90 and NHL 2K6 is $6.60
http://www.amazon.com/NFL-Tour-Xbox-360/dp/B000WS7EFO/ref=pd_ts_vg_4?ie=UTF8&s=videogames
I didn't see this low price listed anywhere else.
EDIT: Madden 08 and March Madness 08 are also $9.90 and NHL 2K6 is $6.60
