I will say that even though I don't like them....I still shop there....for now. Aldi's is coming to N. Texas and I'm excited to see what they have to offer. And I found a salvage store "sort of" on the way home from work....I just need to check them out. So I hope to wean myself from them soon.
I also noticed that this happens at Sam's as well. DH thought I was nuts until I showed him 3 bills from 3 Sam's stores over the course of 6 months. We buy the same things there each time. He thought it was the different sales tax rates, but it wasn't.