Anyone Deal in ATI Super Dampers or Advice on Were to Buy One

I am looking at buy an ATI 917474E 3-ring aluminum damper for a BBM.

Trying to decide the best place to buy one from. Prefer to get it from some place that doesn't charge sales tax. (We all like to save if we can)

Doesn't look like a lot of options on this one, but thought someone might know of a hidden retailer that offers some relief.

Thanks,
Tom