If you go to nationals You will find a few in the ball companies booth at good prices .
this is definitely a good place to find them. I picked up an Ebonite Undefeated Fire and a Hammer Cube at their respective booths at Nats, which both were overseas balls. The Hammer Booth also had a few Black Widow Dangers, two variants of the Taboo Unlimited, and a red Cold Blood (may have been a First Blood), all which were from overseas. They'll generally list what they have in stock on their FB page (it's publicly available, so you don't have to subscribe/sign in), plus offer their phone number so you can call directly to get the ball purchased.
So Nats is definitely a good place to find deals on overseas balls; and with it to be starting this month, they should start to list what they are getting in.
BL.