Gah! I'm totally jealous of you all and your wonderful thrift store finds. I have friends in the north part of our county who always score really good finds. We get all enthusiastic, hit the local thrift stores, and....junk. My friend gets name brand clothing that looks new, crafting supplies, artwork, china, pottery, appliances, all kinds of things. We can find: clothes with the labels cut out, worn and stained clothing, long dresses missing patches of sequins/lace, never any natural fibers (my friend scores linen, cotton, wool, silk), t-shirts with rude logos, small appliances missing cords, bent forks, and all the odds and ends that wouldn't sell at a garage sale.
I finally asked someone and they told me that the stores sort donations and channel the donations to different stores based on the perception of the demographics. So, better items and clothing goes to the stores in the north part of the county, and all the "other" stuff comes to our local stores.