Outdoor flea market every Saturday starting December 1, 2012 at the Montgomery County Fairgrounds, 16 Chestnut St.,Gaithersburg, MD 20877. Many vendors selling antiques, crafts, collectibles, books, household items, art, jewelry, tools, clothing, furniture, electronics and other new/used items. Admission is FREE. Vendor space rental is $25. From Frederick, take I-270, exit 11. Near Perry Parkway entrance to fairgrounds. Across from Hilton Hotel.