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.

https://www.amazon.com/Original-Sculpey-Sculpting-Compound-Oven-Bake/dp/B00LH1TV56/ref=sr_1_5?dchild=1&keywords=Super+Sculpey&qid=1610431683&refresh=2&sr=8-5

Or the grey version which I prefer

https://www.amazon.com/Super-Sculpey-Medium-Blend-Oven-Bake/dp/B019HGI4CI/ref=sr_1_4?dchild=1&keywords=Super+Sculpey&qid=1610431683&refresh=2&sr=8-4

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