Your fear of the UK isn't logical. Not everyone overseas is going to try to scam you. The guy has good feedback. There appears to be only one seller, so I know we're looking at the same guy. The guy looks legit to me, but I can't promise they are, just saying what it looks like. I've been ripped off by people with great feedback before, but this is for like $20, generally smaller ticket items that look legit, are.
Here's a store in the US that has them: http://shopping.microbattery.com/
You'll need to search for it, but it's priced at $25 plus whatever shipping is.
Here is a place that has it cheaper: http://store.linkexpresspc.com/9604t.html
There you go, I know it's not on the forums, but I'm sure you'll apperciate the help any way, right?
EDIT: Just found a place that sells it for about the same price as the guy on ebay, here is the link: http://shop.store.yahoo.com/impactco...ami/9604t.html