Mega Man X (SNES) $7.99
Ghosts and Goblins (NES) $4.99
Until 6-6, buy one, get the other for half price.
So if you're interested in both, buy G&G first for $4.99, then get MMX for $3.99 ($8.98 total). If you buy them the other way, you only get $2.50 off instead of $4.00, so paying $10.48).
I wasn't planning on getting G&G, but since it's a net price of $1 after getting MMX, which I was planning on getting, I figured that I'd get both.