Ford has made over 10 million Mustangs so far. The Fox-body production numbers are a bit over 2.6 million. That means every fourth Mustang that Ford has ever made is a Fox-body, making the availability of this generation immense. In fact, they are everywhere.
The oldest Fox-bodies are now 40 years old. While time, crude modifications, and abuse have taken their toll on the Fox-body generation, there are still lots of nice examples. You can find some high-quality restoration projects and even some pristine low-mileage garage queens with little effort.