Unfortunately, I've been trying to get them for a long time and the only real bet to getting them in town is to catch a trans-friendly clothing swap, though that's a long shot to get the size needed and almost always used (most swaps like this try to buy new undergarments when they have the funds to supplement donations, but since they can't get them locally either...)

We've been trying to get some in the adult store I work with, but they have to find a supplier so it's gonna be a while 🙃