Came across this excellent deal while looking for new controllers for my PC. Will work out of box on 360's but you will need a compatible adapter for use with PC, which can be ordered cheaply from that auction website. Wired controllers cost around same price.
£22.79 with code vbox5 (lowercase)
*edits: 1. remove "bluetooth" - thanks Stimpington 2. add code - thanks oUkTuRkEyIII