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A used, not modified 7m-gte which is still running should be roundabout 700-1000€.
But remember: You get an engine that is running at the moment, you don`t know how it was treated before, you don`t know if it burns water or oil and so on...
If you need to replace your engine, get a good block, a good gte head and put it together for yourself or maybe get a whole Supra with head gasket failure (if the car itself is not so important it`s not much more expensive than the engine itself) - pull out the engine, overhaul it (metal head gasket!) and build yourself a reliable 400+ rwhp car
