DeathAdder (Left-Handed)
Used by 2 peoplerazer.com ↗
“A left-handed Razer DeathAdder mouse, which is pretty much the only existing left-handed ergnomically shaped mouse on the market today (if you know of another, please ping me!).”
Ludovic Chabant Interview, Software developer (Epic) · via Uses This 
“For my mouse, I use a left-handed Razer DeathAdder.”
Aaron "tenderlove" Patterson Interview, Ruby developer (Red Hat) · via Uses This