Why not make them yourself? It’s not as hard as you would think. We decided to make some (from pulled pork) about a year ago. We now make them about once a month. We normally make enough to eat 2 meals off of them and another meals worth for the freezer.
Buy masa and corn husks. Mix mass with butter, chicken broth, cumin, and chili powder. Soak half a pack of husks per 6-8 pounds of cooked meat. Spread the mass dough out. I use a small spatula and my fingers. Put meat in so that you have enough masa on either side to cover it when rolled. Use the husk to start to roll it over. Make the masa dough meet and seal together. Your husk should overlap. Fold the bottom of the husk up so that it comes to the top. Tie with a strip of husk. We use an instant pot/electric pressure cooker. 20 minutes with some water in the bottom Natural pressure release. Or you can do them in a pot on the stove. I think it’s 45 minutes to an hour that way.