MPIII,
Depends on what you mean by a 'project car'. I restore old Mustangs and can tell you that statement covers a lot of stuff, and much of it is garbage.
ebay is one route. Unfortunately you bid and perhaps win something you have not seen in person - and now you own it.
See
www.karmustang.com for a better idea on what the cars cost; before, during, and after.
Check
www.traderonline.com they generally have many cars, and you can sort by year and state - then look at ones closer to you. I just went there and found 105 Ohio State 1965- 1968 Mustangs for sale.
Also, look for a local Mustang club - they probably know someone who has a car locally. ((Oddly enough, we just had a woman come to our club meeting, she had Mustang in storage in Ohio while she was in the Air Force. She is retired now and has decided to sell her '65 Coupe. It is flawless, and only has about 15,000 miles on it. Everything is still original on it!))
Brad