The For Sale Section On this Site
The Wanted Section On this Site
Local Mustang Clubs
Tell all your friends (the one's with car knowledge)
And finally, many share your hesitation with E-bay, but if the car is local and you can look at it....who knows! That is how I found the FB in my signature pic and it was an original Tx. car. There are a ton of good cars here in the Lone Star State!
Check at car shows and cruise-ins. Let the mustang folks know you are looking and serious. I did'nt have much luck with ebay. Seems like once they hit ebay they bring more than they are worth. There are a lot of cars for sale from Texas though, you should be able to find one but it will probably take some time to find a good car for the right money. I've had people calling and trying to buy mine and it has'nt been out of my shop.