I just wanted give you a couple of links that have GREATLY helped me in learning more about pricing and using coupons over the last few months and have increased my savings as well!
One of the best resources I have come across is Frugal Chic Living's Costco Price List. I can't tell you how many times I have found items on sale at the store and thought, "Is this a good deal, or not?" I highly recommend printing of this handy-dandy little spreadsheet and keeping it in your coupon organizer, that way if you come across a great deal you can cross-check to make sure you are getting the best price possible! I consider a sale price a "good deal" when it ends up being cheaper than Costco. For example: Kirkland Signature toilet paper is 17.99 for 36 rolls, that ends up being .49/roll before tax. If I can use a coupon and a sale to get toilet paper (most of the time good name brands) for less than .40 per roll I consider it a good deal. Last week at Fred Meyer I was able to stock up on Cottonelle toilet paper for $.33/roll, way better than the Costco price! A huge thanks to Frugal Chic Living for taking the time to put this together for all of us!
Another Fabule$$ resource is The Krazy Coupon Lady's Printable Coupon Database! This website has a link for just about every printable coupon currently available on the internet. If I have an item on my list that I don't have a coupon for I go check out this list before leaving for the store to see if there is a printable coupon available for that product somewhere out there!
Along the same lines, Deal Seeking Mom has a wonderful Coupon Database. This is a listing of EVERY coupon out there whether printable, from a coupon insert or a magazine! If you are trying to gather coupons for a sale, check out this source to get as many coupons for that product as you can. Just do a search on the database for the brand name you are looking for and it will pop up with all the coupons available for that brand. It's awesome!
I hope this list of helpful resources helps you out as much as they have helped me!