Since the dawn of the F&F you and every other kid old enough to drive has been dreaming of a supra in a junk yard. Your chances of getting a shell "cheap" are only a dream. Guys live to buy these cars before they can get to you so they can keep the market for mkiv's inflated. And I am not kidding, there are guys that fly cross country weekly for the next supra steal at a killer price. I would say for a good condition TT shell look toward 8k + with everything in it blown motor as you say, I would say around 12k. I am sure someone on here is more knowledge on this subject then me, but that is my guess and it won't be cheap.