Well i've been bidding on these all night & they have been ending at 1200 to 1600. 1 months go for around 2000 to 4000 & 12 months go from 5000 to 20,000. I can give you 2000 credit right now, as I need this really bad to hop on xbox live.
these are worthless unless you have halo 4, that is all you can use it for. i found out the hard way. believe me i lost 1610 credits. i dont have halo 4.