a) has a bunch of games they're planning on trading in
b) has any interest in Song of the Deep (or just wants to resell it)
GameStop is offering an additional 20% trade-in credit towards Song of the Deep through Sunday 7/24. The game is only $15, but the extra 20% doesn't just apply to your first $15 in trade-ins. I was trading in $40 in games to get something else, but decided to get Song of the Deep since it gave me $8 in extra trade-in credit. If you traded in $75+ worth of games, then Song of the Deep would be free (or potentially make you money depending on if they cap the extra 20% at all).