I've been looking for grasshoppers for while now and cant seem to come across any for sale. I see people on social media feeding their dragons with them, so i know they're out there.
I think they are rare in the US due to restrictions on their sale/transport. I know they're all over the place in the wild, I don't know the details. They are much more common as feeders in the UK which is likely where the posts you're reading are from.
Yeah. Shortly after i posted this i came across some threads in the forum talking about the US restrictions. Some pet stores may have them, but its more of a European thing. Plus you have to be extremely careful because certain species can be toxic.