The Mrs sent me out the other day to do a minor bit of shopping for her. She loves couponing, and Kroger had a special deal on baby wipes (we also needed milk, but that never gets coupons.)
The deal was, use your Kroger card, get 4 packs of baby wipes for $1.99/ea. She also gave me 4 coupons for $1.00 off each pack, and, with the card, Kroger doubled the coupons. Viola! The wipes were now free! ($2.00 off each pack, which cost $1.99).
Now the Galt part: at least here in Texas, the coupons are applied before sales tax is charged. And 8% of $0 is $0.
It's not much, but hey, that's $0.64 that leviathan didn't get.
Now, if you're one of those super coupon people who get on the TV show, you can go even further. I actually saw on the show once, guy worked the coupons to get an entire pallet of cereal for free. Then he donated the whole pallet to his local food bank. He apparently does that regularly - uses coupons to get large amounts of items at very, very low or no cost to himself, which he then donates to the food bank, homeless shelter, etc.
Make sure and get receipts, and that's a bunch of stuff to itemize on your 1040, and less $$$ to Uncle Sam on April 15.