How much can I really save using coupons?
Most advanced couponers say they save 50-80% on their grocery bill. The amount you save depends on many things, including how much time and effort you put into it. Just to get an idea of the products and prices you can get with coupons and sales, here is my spreadsheet of "best prices" I have got since 2010 when I started becoming a serious couponer.
--Update (Jan. 2016) I haven't added much to this in the last year or more, but I can tell you that most of the best prices are the same or better in 2016 as they were in 2010!