Month of premium membership to whoever..
.. finds me a store with white OEM PSP buttons, that actually has some for sale. Also by OEM, I mean it cannot be third party or anything (why? because i'm picky like that).
1) First one to find one that fits the above criteria wins. Although I might be generous enough to give a lil' something to the runner-up.
2) Low price is a plus (IE: less than $50)
3) Accepting UK stores.
4) I will only pay one month for you, and if you're already a premium member.. well you can have a cookie or something.
4a.) Update: You can direct the premium prize to a user of your choice if you win.
5) No cheating. (but how could I tell, really?)
6) Edit: No exploiting loopholes in my rules. I know how clever the internet is nowadays. :p
Get going, glhf.