I stopped into PetSmart and found the rebates mentioned here. Purchase any bag of Iams Dog Food and receive a voucher for another free 4lb bag. Send in UPC and receipt before 6/30/09. Since I got 3 bags for free already at Walmart (I did find them at the second store I visited)- I will be submitting this rebate! I picked up 3 extra forms at my PetSmart so the first 3 readers that leave a comment with email address below can have them! I will contact you directly for your mailing address.
(I found the tearpad attached to a display of 4lb puppy chow on an endcap in my store.)