My favorite, by far. They have awesome own-brand stuff, reasonably priced organics, random British items (hello, Spotted Dick!), and a mailing list that will pop 20% off coupons into your inbox. Oh, and samples to keep your toddler happy. They don't accept manufacturer's coupons, which I can live with, and which makes shopping fairly stress-free.
Watch your email or check http://www.retailmenot.com/view/freshandeasy.com for printable coupons. You can use more than one per order if the total is enough before taxes (so, if you spend $65, you can two $6 off $30's). The markdowns can be good, too, and their normal prices are reasonable.