I've been reading MoneySavingMom's blog for months now, and it's a clearinghouse of information on savings through coupons and weekly sales.
Each week she will post sales from various stores (Target, Walmart, RiteAid, Walgreens) and combine them with coupons. Many items end up being very cheap, free or even eligible for an overage (meaning YOU get money for taking the item out of the store). There are links to each coupon and if there are restrictions or limits she'll let you know.
She also posts other money-saving tips and information gathered from other money-saving moms that contribute to her posts.
I love her blog, and highly recommend it.