A green poster, you say? Hmmm... that might be something of a rarity. As long as you're not one of those people that insists that C3PO is "silver", then I'd look after that, if I were you... "More" isn't that easy if you're looking for vinyl, but check out
www.rockofages.uk.com. They've got some cool stuff, and a weekly sales list.
Cheers,
Mark