Are we talking Goodwill-esque thrift shops, or consignmnet? I noticed Tarrytown seems full of consignment shops, but they seem to be more boutique-oriented as opposed to true thrift stores.
I was at the Goodwill in Elmsford a while ago and thought the prices were relatively high and the selection was sparse, at best. That said, the last Goodwill I visited was a huge warehouse in the Midwest, so my shock may just be due to region.