Patrons can buy beach gear, fishing equipment, barbecue essentials, foods, snacks and magazines for their beach adventure at the Onslow Beach Marine Mart aboard Marine Corps Base Camp Lejeune. The facility held a ribbon cutting June 4. - Patrons can buy beach gear, fishing equipment, barbecue essentials, foods, snacks and magazines for their beach adventure at the Onslow Beach Marine Mart aboard Marine Corps Base Camp Lejeune. The facility held a ribbon cutting June 4.