I'm not sure when you get paid, but if it's the last day of the month or somewhere near that, feel free to send it then when you have more money. I think the week thing is to be sure but we've never had any issues.
Art books are cool but I do have the odd guide in collection. I've just searched eBay for the key and only 1 is posted on .co.uk. It's being shipped from Singapore to! I have just found out that Rayman Legends has a special steel case edition, which is a UK only thing. Issue was, a crap store (HMV) that has already been out of business once had it as an exclusive... Why I don't know.
Case is going solo on eBay, so may pick it up because it looks cool. [Picture]
Might also grab that Sam Fisher Silver Blacklist statue. Little too expensive now, so hopefully it'll drop soon.