Who is going to be giving used gift cards this year? But more seriously, someone needs to make a firefox plug-in or app that automatically searches for discoun

Who is going to be giving used gift cards this year? But more seriously, someone needs to make a firefox plug-in or app that automatically searches for discounted gift cards when I happen to be browsing Amazon, etc.. And there needs to be a search engine for these gift cards, because I want to buy the 40% off Harbor Freight variety.