They are, unfortunally, only available to US members. But maybe you can find a US member willing to help you out, once you have joined the ranks of the contributers.
I have one on the way due to the helpfulnes of a kind US member who is also a contributer.
At present, that's the only one (if memory serves.)
We're working on (well, John is working on it, we're riding coattails) getting an order of Glencairn whisky glasses with a B&B logo ... contribs get a discount.
We like to toss a perk or two to the contribs from time to time ... it's not a guaranteed schedule or anything, so don't sign on as a contrib just to get loot