He's tipped off -- and wants everyone to know.

Brooklyn food deliveryman Larry Fox, 20, received a $3 gratuity last month after delivering an $89 lunch order to the wardrobe department of the CBS show "The Good Wife." It was the tip that broke the cyclist's back.

The grub-runner, who has worked for Mexican restaurants and upscale delis in Williamsburg and Greenpoint, launched a Web site called "15 Percent" (15percent.tumblr.com), where he posted receipts, names and addresses in…