If you have a hard time acquiring one, you may find it easier and cheaper to get similar
ZF5HP19-FL transmission from an Audi or VW:
This thread was a manual gearbox swap, but same general principle. I'm not sure if the electronics are plug and play, but the control unit looks the same.
http://986forum.com/forums/general-discussions/56662-audi-swap.html
Here's a listing at a local(?) shop:
http://www.trademe.co.nz/motors/car-parts-accessories/volkswagen/auction-921538537.htm