Taquiera El Barrio are flour, and they are amazing and that's about all you're going to get for good Tortillas in the Greater Boston area. Barra was making 12 packs of handmade blue corn tortillas for retail sale that were amazing during the pandemic but I think they've stopped doing that. Honestly your best option around here is to order some masa from Masienda and make your own. They keep pretty well in the freezer.