A couple of months ago I started noticing popups on various ecommerce sites offering a first purchase discounts in exchange for entering an email address. Every time I noticed this happening I took a screenshot to track the offer and compile a list of the retailers using this approach. I’m still collecting examples and would more of them but so far the going rate seems to be anywhere from 10 to 25% off the first order. The pitch is pretty compelling and I think most people would gladly give up their email for the possibility of a discount. I’d also love to know what impact the magnitude of the discount has on the sign up rates; I suspect it’s minimal but definitely better than gaining entry to a sweepstakes or a lottery.