The Treasure Coast Marine Flea Market and Boat Show Announces 2018 Dates, the 5th Annual Event is set for October 13-14 at Indian River Fairgrounds in Vero Beach, Florida.  For two days, October 13-14, the 139-acre fairgrounds will be transformed into the Treasure Coast largest nautical ‘Flea Market.’ For boat owners, fisherman, divers and anyone with an interest in all things nautical, the Treasure Coast Marine Flea Market is a bargain hunter's dream-come true. Private individuals and marine related businesses sell used marine equipment, marine antiques, new and used boats, fishing tackle, diving gear, marine artwork and other boating related items at unbelievably low prices.