As I was out snowboarding today I figured I'd throw a 'disposable' item on the wrist...
I bought this is 2003 or so just because of the lightweight - an all aluminium Swatch Irony Mighty. I recently had the battery replaced and wore it again as I'd forgotten how un-noticable it really was at an ultra-lightweight 64g!!!
Quite possible the cheapest watch on this thread by some distance!