Don't bother importing the tranny. It's the same as the USDM far as I know. Just get a 4 speed from a junk yard out of a Corolla (someone correct me if I'm wrong), but far as I know, it bolts right up (will have to change the shifter too?)
Otherwise get a 3spd from a Corolla base model or a Prizm.
Otherwise get a 3spd from a Corolla base model or a Prizm.