I built my own racing sim frame for about $30. Just took some metal tubing, and welded a frame together, about $10 in materials. Then bolted an old car seat from a Subaru Impreza, about $20, to the frame. With a Logitech G25 wheel and a 23" monitor completing the assembly, it's nothing short of awesome. I have it hooked up to my PC and have a lap board next to it so that everyone who comes over posts a lap time around Spa; similar to Top Gear's "Star in a Reasonably Priced Car" segment.