Garth Lax's emails highlight some places to tour on your own, including antique and flea markets.
I have made some excellent finds at NYC flea markets. About four years ago, at the Hells Kitchen Flea Market I found a yellowed envelope on an antique dresser. Inside were 12 of the 16 advertising paper dolls for Stollwerck's Breakfast Cocoa, for $25. Some of the little arms were missing, but Puss in Boots and Little Bo Beep survived intact!