Lets start a post where people can come look at pictures and grab ideas how to build / buy a sim rig. If you have a good estimate of what it cost you with a breakdown of parts / materials included that as well. Share away!
Below rig was built out of ~$125 worth of 2" PVC and a used 350z passenger seat.
Total materials used: 40 feet of 2" PVC pipe, I also bought a box ( 25 count ) of 90s, 45s, Ts; 2x4-way fittings and 2x3-way fittings and have a bunch of left-overs.