The mk2 variant is known as the Spider.
The Mk3 is the Spyder.
I'm not sure if you've seen this thread but there's a bit more info on this car there.
mr2.ie/mr2-forum/10-general/4791-info--h...-the-trd-sw20-spider
You'll notice in that thread I post up any time I see one for sale, which isn't very often.
I regularly browse auction sites and on the odd occasion a Spider does come up for sale its always been in the N/A guise.
So if you do manage to buy one you would more than likely have to convert to turbo yourself.
Alternatively you could buy a t bar turbo car and convert it to a spider yourself.
Patrick from the UK forums has done this recently.
The thread for his project can be found here...
mr2oc.co.uk/forums/125/154430.html?hilit=trd%20spider