People can try the new Hills Science Diet Ideal Balance food for cats and dogs for free after rebate (up to $12.99). Customers have to buy the food and send the rebate form with the receipt and the UPC from the product's bag.
http://www.hillspet.com/pdf/en-us/IB_rebate.pdf
I may try this offer. I used two of their coupons today with no problem at Petco. (Very nice if you have the Pals card because the manufacturer's discounts are added to the Pals discounts).