Okay, I'll give a serious reply. I'm only going to give prices for the OSTs, since there's about 9843046540219604132166241 versions of every FF soundtrack.

FFVII: $30
FFVIII: $50 (I could only find the boxed set)
FFIX: $30
FFX: $40

That's a subtotal of $150, not including shipping and handling if you order from Toys N Joys. www.toysnjoys.com