SoCal, I don't know anything about PeonyUSA. I do know that peony Shop and Warmerdam grow their own roots.
Alex, I didn't order from Warmerdam. I got on their website late, and the ones that were left were available in the US. I think there were others that got an order in 2021, so maybe they can give insights into the fees.
That lovely peony is Henry Bockstoce.