Get some Infinity Kappa 692.9i's off Amazon for cheaps. Or the 693.9i's.

Or you can buy my stockers from a 2004 GP off Ebay. I have them listed at $40 obo + $20 shipping, but I might be able to cut you a deal

EDIT: Also, look on Amazon and Ebay for stuff you find on Crutchfield, it's usually about 50% of the price.