You probably won't find much in the Wrangler dept for that budget. You will find Wranglers but it will be the square headlight version, most likely 4 cyl and will need work. Rear seats on the Wrangler with the square lights if they have them are most likely lap belts. 97 up have 3 point belts for the back seat.
You might want to look at a Jeep Cherokee, same engine and mechanicals not as high a resale.
Check these for Jeep forums and used Jeep sections, always have tons of stuff.
www.jeepforum.com
www.jeepsunlimted.com
They can be addictive too.