N/As aren't difficult to turbo, but you do need quite a few pieces of equipment to do it. By the time you end up doing the swap, you'll probally have spent enough money to buy a decent quality turbo MkIII.
For a full GE to GTE swap, you need engine, ecu, wiring harness, boost gauge, and a few other things that escape me right now.
I'm not sure what's involved with the 1/2 NA->T swap (turbo'ing a 7M-GE motor) but you definately need a turbo. (someone please post more info on it here -- I know nothing
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I searched for 6 months before I found the supra I wanted, in the condition I wanted it, but it paid off in the long run.
I suggest you keep searching ebay, autotrader, your local paper, and any other source of for-sale cars for a turbo in good shape.
much luck to you!
CCC