how much would it cost to fix these?

Here's a 6 speed Supra Twin Turbo that was in a fresh water Texas street flood. This is an insurance claim settlement vehicle. Mileage is 51,200. Known Defects: The engine will not start

http://www.autosource.ws/ad/94-TT-SUPRA-1.jpg

Here's a 6 speed Supra Twin Turbo that was stolen and then recovered by the insurance company. This is an insurance claim settlement vehicle. Mileage is reported as being 44,000. Known Defects: It was recovered without keys, no attempt has been made to start it. Various dash components are missing

http://www.readytofix.com/Inventory/94YELSUP5.jpg
http://www.readytofix.com/Inventory/94YELSUP1.jpg

Here's a low mileage Twin Turbo !997 Supra that has sustained readily repairable damage to the left front corner.

http://www.readytofix.com/Inventory/97sup01.jpg
http://www.readytofix.com/Inventory/97sup02.jpg
http://www.readytofix.com/Inventory/97sup03.jpg
http://www.readytofix.com/Inventory/97sup07.jpg

the only one I'd take would be the 1st one... cheapest to fix I reckon... ie swap out the engine with another one :)

how much would a new engine cost? supra and v8 people seem to be talking about around here.

Around US$1000. But then you gota pay someone to do it which could cost you another $1000 unless you do it yourself :P