I was at a shop yesterday and they mentioned they had a Miata for sale. I haven't seen it, so I don't know about the condition or anything.

1999 Miata
109k miles
$5500 OBO

It's located at Complete Aerokits in Arlington, TX. Talk to Tommy.

It's located off Pioneer on the northside, between Fielder and Bowen. I don't have the exact address handy, but I am sure you can look it up online.