Well, evidentally the Coupon Queen who is teaching this precise method in her Coupon Classes claims that she saves several thousand dollars in taxes each year.
If you live near an Albertsons, then definitely save Marcal coupons. Every few weeks Albertsons sells Marcal TP and paper towels for just a buck each. The Marcal coupons makes them free so you just pay the sales tax. I usually stockpile about 20 of those items which is enough to tide me over until the next sale.