From the Black Ops Dept.:
Look, I am not condoning any large-scale black straw thefts here. But at least try not to be obvious about it.
And at least buy a bagel or something while you're there.
UPDATE: Apparently Cheesecake Factory uses black straws, too. If you know where to find black straws, or want to see where else others have found them, hit the comments to find out.
:: Panera Bread Location Finder ::