G.B.
Two of my favorites in Pleasanton, one of them country french, have already gone out of business. There is still one consignment store that I know of in dublin, I believe the street is called Villiage Parkway. It is not upscale per se, its just a run of the mill consignment store.
Don't forget you might find things on Craig's List, online.
Summertime finds all kinds of garage sales on the weekends here in Livermore.I don't even use the paper, I just drive down Holmes st., between Concannon and Mocho, and follow all the signs. The intersection of Mmurietta and Olivina usually has several garage sale signs pointing in all directions as well.