Vintage Lot Of 134 Mackinac Island Michigan State Postcards. These came from the estate of a major postcard collector and postcard dealer. Each card is in its own protective plastic sleeve and the price on each card was the former owners prices. That sticker is on the sleeve not, the card of course. I’m not sure how accurate or realistic those prices might be. She had well over 2 million cards and obviously can’t update the prices on two million cards on a regular basis.