Mary Hunt writes this newsletter, right? If so, I have one of her books (Cheapskate in the Kitchen), and I'm not a huge fan. Her ideas are okay, but they're nothing you couldn't figure out on your own (i.e., buying specialty coffee drinks at Starbucks is expensive, buying a pound of coffee at the store with a coupon is cheap -- I doubt this is news to you).
If you're looking for serious money-saving tips, I suggest you buy a copy of The Complete Tightwad Gazette by Amy Daczyn (I know I spelled that name wrong). It's a compelation of three previous books and her newsletter (which is no longer published). Some of her ideas are, frankly, too extreme for most of us; however, I like the way she breaks down the prices and compares them. Even if you don't want to use a particular idea, often you learn from her method of thinking. Her books were written more than a decade ago, and prices have increased; still, you can learn from her concepts. One of my favorite things from her book is the grocery store price book. She explains -- in great detail -- how she created a spreadsheet notebook to keep track of the prices /sales on grocery items she buys regularly.