If you're new to the concept of shopping for free you need to check out How to Shop for Free. If you're a veteran bargain shopper, you may only find one or two new tricks. I've been shopping like this for years and I will admit that it's possible to get $100 worth of items for $30 at the grocery store. I've even managed $100 worth of items for less than $5 a number of times. Like the author, I agree that it isn't easy. It requires dedication and lots of work to do this every week. You also need to have access to the stores that offer these amazing bargains. While Sephora and Ulta regularly offer freebies, if your closest Sephora is two hours away, that's not going to work well for you. Kohls regularly offers $5 off coupons but if you have no Kohls in your area, that won't help you. Spencer does list the stores that are the easiest to freebie shop at and she offers suggestions on how to find those freebies at other places that may not be listed.
If you have the stores and the time, How to Shop for Free will certainly help you reduce your expenses. If not, it will teach you the skills to hunt for your own bargains in your area.