Giving Discounts on Products

I have a store that (mostly) contains vendors for other creators' products. I'd like to be able to give discounts on things in my store (say, "10% off anything you buy in this store", or "L$20 toward the purchase of anything in this store", but I'm not sure if this is even possible. Is it?

This is the way I'd like it to work...
I'd like to be able to give discount cards (a scripted prim?) to residents as I meet them in-world and have them come to my store, purchase something, and have a portion (either a percentage or a fixed L$ amount, like L$20, for example) of their purchase price returned to them after they have made their purchase.

I'm not sure something like this is possible because the vendors in the store are not mine. I only receive a cut of the sale price when someone purchases something. Is there anything out there that does this and doesn't need to be integrated into the vendors themselves? Any links to more information or available products would be very much appreciated.

Thanks for your help.

if the vendor is modify (the prim itself) maybe you can place another script inside of it with a fixed amount to refound (% of your cut) with the money trigger event.

PS:if you are intrested on code it your self try to post the same messagebut in the "scripting tips" or if you are intrested on some one else to code it place it in "products wanted" in that places you have more chance to some people see it.

This would be very hard to automate and implement.First you would need the owners permission.Unlikely I would think since they would be taking a cut in profit just at your store.
Vendors % differs for each affiliate so that poses a problem.
If you want to give a personal discount from your cut then that's your business to give as much as you want.It would have to be after the sale and couldn't really be a fixed amount since all items are priced differently.
If you are just trying to give your place an edge I would look for an easier method but if you want to be philanthropic just give a refund from your % after each sale.