looks like the xpg2 maxes out at about 2.6a, and not a huge boost in lumens from 2a, so i would say that using it with a stock driver in the zy-t13 would be fine. though i dont feel the zy-t13 has the best heat sinking, so try it at your own risk. worst that could happen i guess is loose a few dollars on an emitter.
i got mine from ebay for $25, just because i had a gift card for ebay. you can find them all sorts of places. i know wallbuys has frequent sales, and a lot of times they include this small sun. do some searching first. dont just buy from wallbuys because i say they have it, its your choice. they have kind of shady practices, though seem to ship fast and reliably….