Some do.
If the coupons are for Gamestop then you can in fact go to Gamestop and use them. They will not however accept coupons from other stores.
Toys r us or gamestop.
There must be one store that lets you sell used games and DVDs. GameStop does that.
No
im pretty sure they do cuz ive seen some movies there
Yes, they do. I've paid them via check.
No. They accept credit/debt card or pay pal.
Gamestop / EB Games
Yes
Yes
All Credit cards
Yes, Gamestop will accept copies of Pokémon HeartGold as a trade-in without the Pokéwalker. See the Related Link below.