Wow! That's a deal! (watch out for falling sarcasm.)
But, the one thing to remember about JP games is that though you may be able to boot it up using a freeloader, if the game needs a memory card, you can't use a US memory card. You need a JP formatted memory card.
Games like Mr. Driller Drill Land are affected by this and thus, become virtually unplayable without a way to save.