You can totally build a cockpit for under $100 including the seat. I just did it and can post some images later today.
Would love to see pictures. Can't wait to get started on this. Never pulled a seat before or did junkyard diving. But I am willing to try!
So here are other random thoughts...
1) I just looked and don't have a junkyard around
2) Did some craigslist searching and came up w/nothing.
3) I really like how light the JEGS seat looks (being plastic) One of my ideas was to make my cockpits is to have it come apart in pieces for storage.
Heavy seat = permanent fixture =
4) I could call some of the places that tow and find out where the wreckers take things.. but then again.. heavy seat.