Hoses
 

Where is the most affordable place to buy the many hoses on an MA-70 GTE?

most affordable... probably your local auto parts store in bulk and cut them to length yourself. As far as kits go, ebay has some cheap shit most of the time.

Beware of that word... cheap. Doesn't necessarily matter a great amount with hoses as most of them are about the same, but I wouldn't try and find the cheapest available, especially off Ebay.

If you're in the Supra for the long haul I'd go with some good silicone hoses for the vacuum lines, and any quality line for the water. Some of those can be a bitch to get to, so keep that in mind before purchasing a replacement.