I have a X-ARCADE DUAL JOYSTICK for sale, for use with PC, but other adaptors can be bought to be used with, xbox, gamecube, playstation etc.
Excellent for emulation...
The setup is in like new condition, with original box.
These things are built to last... very very robust.
Looking for upwards of £70.00 + £8.00 p&p.
Open to offers...
More info here: -http://www.xgaming.com/two-player.shtml