Came across this UK seller on Ebay with quite a few exclusives listed (ehobby, botcon, US store exclusives), and with less than 2 days to go, most items didn't have any bids yet.
THey appear to be reliable (high feedback) and ship internationally, but from the UK, shipping could be a fair bit.

I bid on the micron booster pack because I need one of the figures in the set, but don't let that stop someone who wants the set more. I'm just hoping some of you win some of these at minimum bid (most starting bids seem quite reasonable).