Mike:
Sorry 'bout that, didn't realize Barlows were whole-salers.
I get mine locally at Fishing & Outdoor World in Darwin, but if they're out of stock I simple order on ebay.

Here is a link to an ebay seller in Memphis USA who will ship anywhere, and has 3 different sizes available including all three sizes in one pack if you choose that option:

The Flytier

Here's a couple in the UK:

LureFactors

Ted Carter

Hope those links work OK for you.