First thing Id do is check with every local tuner shop, and see if they have any from people doing 5 speed swaps in S13's and S14's. Any tranny from an S13/14 will fit your car, so you shouldnt have any trouble finding one. I think I may have one at a friends house, even, if you want it, no one needs auto tranny's.

Seriously, a shop will probably give it to you for dirt cheap or free, if they arent crooks.