http://www.ebay.com/itm/3D-Printer-L...IAAOSw2XFUZcbh

this is a decent machine - basically a replicator clone with just the one extruder. metal frame, decent build volume and lcd screen so you can run it without being connected to the computer. Which as far as I can see none of the printrbots have.
For me that's a pretty crucial omission. For anything that's going to take more than about 20 minutes I always print from the sd card.
Means I can switch the computer off and leave the printer to it.
ALso means the only thing you need to use the printer is a single power outlet.

And printing a full shell for a car will take a few hours :-)