Several readers have e-mailed me about Kmart's announcement that it will double the face value of manufacturer's coupons, up to a total of $4 off each item. I checked with Kmart, and the company says the promotion is good through Dec. 6. Since "certain restrictions apply," it sounds like it would be a good idea to call the store you are thinking of shopping at for details. Many Kmart stores have food, so this could be a good opportunity to stock up on some highly discounted or even free food items. The folks at stretchthatdollar.com already have compiled a list of how shoppers can do just that.