My donor is a 1990 Mustang GT. My brother (FFR# 4141, Hootie on cobra forum) located this repo for only $500 (that's him in the last picture, below. He's the mechanical genius of the project.). We drove to Spartanburg, SC the next day and picked it up.
The car had no engine (which was O.K., we were planning to purchase a crate engine anyway). The story is that the kid who had the car sold the engine because he knew the car was going to be repossessed. He also poked holes in the tail light assembly lenses. The interior had been abused, but the mechanicals were in good shape. The only real damage was on the front air dam, which was busted when the repo guys took it off the rollback.
We should easily get our money back on the transmission, bellhousing, rear end (I have a 1994 T-Bird IRS that I am going with) and body parts, so our donor parts were essentially free.
It almost seems ashamed to teardown a perfectly good Ford Mustang GT, but when you see the end result, you don't feel so bad.
Update - 01/25/04 - The donor is torn down. Sold the carcass of the donor for $300. That means our donor parts only cost $200.