You could put one of those ads in the classifieds that says 'take over payments on blahblahblah car'. There's a ton of those ads in the Dallas paper. Perhaps you could convince some poor rube that they need an 80K Accord for $370/mo. Or, you could do $350/mo and eat the $20 each time, or charge the poor rube a $20 service charge per month.

Hit up some unsuspecting kid. If you're going to do it, be sure you have a thorough contract made out with significant penalties for breaking the contract (use your imaginiation).