In the past two days, I have been to not one, but two Targets. Neither had these pants in the size you requested. One store was out of stock, the other had 3 pair, 2 in xs, and 1 in small.
I'm sorry, I really thought I would find them, since just a few weeks back there were at least 20 pair at my home base Target Store, which I affectionately refer to as Target A. There is one more Target I can check, though likely not until Monday (it's at the crazy busy outdoor mall).
I wish I had better news.