It's unlikely to find them for sale in the US, especially as food items. They're breeding is slower, and more seasonal than crickets, and they take longer to reach full size as well. AND, they fly. I know locusts are used as feeders in Europe (I think) but due to USDA regulations, I don't think you'll see those available as feeders either. If you need something large, look into breeding your own larger species of roach. Most breed/grow quickly, and if you need something particularly large, look into the Madagascan Hissers, otherwise, Dubia roaches usually work well. Besides, once you get a breeding colony going, you may not have to buy feeders again!