Interesting. I would say that I wouldn't have thought shipping costs would be THAT big of an issue.
But then I think about where I live. We have two MAJOR ports, which means we've got container ships showing up to be unloaded onto trains constantly, and we've got 20M+ people in this metro area, so it would make sense that there are a LOT of consumers here so anything that can be put on a train on the way here helps, so trains can be pretty full going both ways.
I mean, the costs I quoted were based on bulk packs from Costco, so there's savings there, but it still seems crazy that you're paying >2x for wings and ~3x for chicken breast. I wonder what those items cost at your local Costco--a Google Maps search suggests you've got one ~30 min away?