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MotoGP God
Bikes: 748S, HM1100S, V4SP, Was: DD-A #111
Posts: 13,088
Join Date: Feb 2002
Location: Back in Essex
Mood: Passion Killer
Yeah, mine fell out too!
As Paul says, you can open it by just pulling the cable, so you're better off leaving the lock off and tucking the cable out of the way.
If you really do want one, try and find one second hand as they come apart easily and any decent locksmith should be able to cut new pins (actually they're plates) or modify the existing ones to accept your key.