I work as a collection manager for a finance company. Most law requires the finance company to sell their repossessed vehicle at a dealerís auction so they can collect on the deficiency balance. The ones that donít sell at auction resell their cars on their lote (tote the note/ dealer financed). See if anyone has a dealer license and would be willing to hit auction for you. You might also search for an auto broker which is someone who searches for the vehicle of your choice for a small fee.
Also, check out http://dfwcarsforkids.org/home.asp
or your local police auction. DFW cars for kids accept donations which is a tax right off for the owner. They vehicles are then auctioned on Saturday. I have seen some car that need a little help sell for $25. You might find a nice project there is you are willing to put the time in. The vehicle listing is available Friday.