Is DXM powder legal to buy in the US? Where?

I was wondering if there is anywhere to buy DXM powder online in the US? Maybe a place online outside of the country that ships discreetly to the US? DXM is an unscheduled drug and there are no laws in my area banning recreational use, but there are problems buying powder online such as mislabeled drug laws, etc. If you can buy this product online, where?