Price wise, I can’t help there sorry always seems expensive until you make your own clay (oil based not polymer). But I’m finding a few links through Amazon us. I changed the zip code to a random Florida zip code and it mentions they can deliver.
Or the grey version which I prefer
Also if you do switch over to monster clay I do have some pointers that can help.
But if you prefer a medium that is finalised once sculpted there is also apoxie sculpt. Two part epoxy clay that Jim McKenzie on Instagram and YouTube uses a lot for his final products. Not cheap but a different option if you prefer