Did a little more digging into this myself. The prices up in NE IN are tempting as I have a daughter in Muncie/BSU and could maybe do a side-trip for feed.
My data points for AQ500 are:
Bloomington Co-op: $44.60
Bedford: $37
Mooresville: $40

All are order ahead and pickup later Purina dealers. They have no sales volume in fish feed. The Bedford guy was extremely helpful (a small ma&pa place). He admitted their cost has gone up ~$7 this year. And their markup is not that much.. thus they were the best price in our part of the state. My pond is only 12 mi from Bedford, so that seems the way to go for me as long as the creeks aren't over the road again. Plus he has some AQ4000 on hand he'll sell at cost that my forage fish should love.

If what he said about dealer cost is true, those selling a $32 bag almost have to be selling last year's / pre-cost-jump bags.