Nerf Rival 18-Round Refill and 12-Round Magazine - Walmart.com
Amazon.com: Linn James 4 Pack of 18-Dart Bullet Quick Reload Clips - This Magazine Cartridge is Great for Play with Nerf Guns N-Strike Elite Series Foam Dart Blasters and Accessories : Toys
Worker 15 Round Magpul Style Magazine Clip for Elite (multiple colors) – Out of Darts