If you dont want to be spending on repairs/maintenance then buying a car that came out 15 years ago with many of them on the road being in excess of 10 years old, will always be an issue. Parts deteriorate with wear and tear, replacements can be a while in arriving as it is not a current model, but for most people the passion for the Supra outweighs it all
Sorry to hear about your misfortune but hopefully you'll ride it out and stick with it. They're fantastic cars when they're running well, which most of them do most of the time. good luck sorting it out.
L