Does dollar tree sell clay?

I don't know, and the various Dollar Trees as well as other dollar stores may carry different things or at different times. 

You also didn't mention the *type of clay* you're wanting though --an air-dry clay? polymer clay? epoxy clay? or plasticine-type clay?  They're quite different from each other. 

ive never seen it there, call them and ask them, you might be able to get it from amazon since they sell everything

I doubt every dollar store sells exactly the same stuff so the answer is maybe.

In my many trips through Dollar Tree I have never noticed clay, but I can't say for a fact that they don't have it.

Dollartree.com try that