Well there are a few ways we can do it.
Set up a sticker thread and have direct payment to an email account using paypal (which also supports credit card payments for non paypal users).
I could maybe implement a shop system, again using paypal, this would also allow purchasing of other merchandise etc later down the line if we decide to have them.
Then there is the option of creating the Platinum account subscription for a few £ more than Gold which would include the stickers in with it and also other advanced goodies.
Let me know what you think.