1993 Ford Probe GT head gaskets.?

I recently bought a 1993 ford probe gt. I found out that it needs new head gaskets. I live on a budget [as most people living in this lovely economy have to do now] and cannot afford anything too expensive. *especially considering that the price of gas will be about $5/gallon by the end of summer!* ANYWAY; i was hoping that someone could tell me somewhere to get cheap auto parts. I have a wonderful mechanic who is not charging me for labor :) but it would still be nice to find a cheap part... I live in michigan. Can anyone think of anything??