Group tags & Shops

I have seen in some shops that if you are wearing the shop's group tag, you get a percentage off the price of certain items. I want to do this in my store, how do I go about it?

I imagine something like this would be built around the script function llDetectedGroup. If you feel up to it scripting your own vendor shouldn't be too difficult - you'd get plenty of help in the Scripting Tips forum - or you could look for a scripter to do it for you, or you could buy one ready made. The classified forums would prove useful for that, and you could try searching the classified ads or looking on XStreet too.

ETA: Or you could have a look at one of the vendors you've already encountered, and check the creator's profile picks to find their store.