Amazon subscriptions
Amazon has a (relatively) new service called subscriptions. For many of the food and household goods they sell, you can configure a standing order to ship a set amount to you every month (or every few months) automatically. This comes with free shipping and a 15% discount. I am a big fan of the Chocolate Chip Clif Bars
and tend to buy them in batches throughout the month when I’m running low and I see them at decent prices. Using the Amazon subscription service, the price ends up being just under $20 for each box of 24 or roughly 80 cents a piece. This is cheaper than I’ve ever seen them on sale anywhere and has the convenience that they will just show up on my doorstep automatically without any additional effort on my part. Plus I get my 3% kickback with the Amazon card.