the turbo cost me pretty much nothing, i swapped it with a mate for a sidedraght inlet manifold for an escort.
i think it cost him $50, he got it from a swap meet.
they're an import item, so they're pretty scarce, but i'm sure the charade brought out a petrol turbo aswell, and it was around 550cc or 660cc. i reackon they'd work just aswell as the one i'm using.
otherwise the 'smart car' turbo would be the next factory unit i'd be looking at, but they're a bit expensive, and more trouble to fit.
I hope this helps.