CVS has the 3.5-4lb bag of mini chunks for 5.99 this week. While that's not as good of a deal as the Publix price, it could work out well if you need to use up some ECB's. There is a rebate form found in the summer aisle where there is an Iams display. There you will find a rebate for purchase one bag and get a coupon for a free bag.
So buy 1 bag at 5.99(I believe regular price on these is between 7.99-11.99!) and send in for the rebate, get a free bag. Each bag would work out to around 3.00 plus a stamp. This could be a great way to use some of those ECB's from the soyjoy deal or if you have those great x/xx coupons that I NEVER get.
Plus, if you try Iams for 4 weeks and don't like it. You can get your money back! That's right they have a 100% satisfaction guarantee.