Don't worry, gamestop is smarter than us. Go to one of their stores and buy a code for the DLC. It will be $10 on one of those cards.
i know, i've considered it, but lately i've been a bit too busy, since the gamestop closest to me is a half hour trip (i still go to it since it's my favorite gaming store

)
EDIT: @Intact Garden Gnome, thanks! that's why im having trouble deciding, i've heard OWB was good, and yet i don't want to rush and buy it and find out i really should've gotten LW hah