I love offers like that. They’re IMHO really only good to someone that sees a shitload of traffic go thru their site, because
1, who wants to go thru their sites and add this promo when they know they’ll have to take it down tomorrow? Certainly not somebody in a position where they are searching for traffic sources. Perhaps an email campaign would be your best bet, but good luck finding qualified opt-ins in this short amount of time.
wish I could be of help, but you’ll need more than I have knowledge of; to turn that into a profitable head start.