[quote name='BmBoWnZ']The way I understand it, they only will give you less money if the product shows up missing components (Ex: saying you had the manual and artwork but sending it in a blank case). Because I did a test, running the game as complete and then as disc only. Complete was $30, whereas without manual/cover art was $15.[/QUOTE]
I feel obligated to mention that when I search for LBP on gamestop.com, I receive the message "This used product is guaranteed to work and may not include an instruction manual or original box." In other words, Gamestop's usual complete guarantee doesn't apply. I would've done this easy flip, but you may end up coming short.