Your local CEX shop and Magpie might be a waste of time as they're not interested in creativity software and to get a decent amount of money from Magpie you'd have to sell a Half your CD/DVD collection or a small pile of the latest must have games to get a decent amount.

Can't you donate them to a local community computing/IT resource centre, donate to a jumble sale or give them to a neighbour or have a neice/nephew to get interested in it?