$40 (Legit & Unused Portal 2 EN Key or Gift, it depends which I have atm) – PayPal/Moneybookers. This is not a "RuneScape" subforum to use your RSGP, mostly very small part of buyers/sellers accept/do deals with them.
Some people don't have PayPal money + even if they have, they can't purchase games off there (because of Unverified PP account OR/AND other issues, it depends, dunno).