Starkist is offering a $.50/1 Starkist Tuna Pouch Printable Coupon on Facebook. Wait for a sale and use at a store that doubles for cheap tuna.
Other coupons of note:
$1.50/1 Playtex Tampons – there is also a $2/1 Playtex Tampons still available
$1/2 Weight Watcher Sweet Bakery Items
$1/1 Slim Fast Item – if you can find single bars, they might end up being close to free