Today only, Walmart.com offers a bag of Iams Dog Food in eight varieties for $17.88. Plus, shipping is free. To top it all off, fill out this form to get a voucher for a second bag of Iams Dog Food (up to 8 lbs.) for free via mail-in rebate. That's tied with the best offer we've ever seen from IAMS Pet Food. Note that the voucher expires June 30, and that it may take six to eight weeks for the voucher to arrive. Sales tax is charged in most states.