Amazon.com: NERF Rival 50 Accu-Round Refill, Includes 50 Accu-Rounds, The Most Accurate Rival Rounds, Compatible with All Rival Blasters : Toys & Games
NERF Rival Refill - 60 Rounds - Blaster-Time
Nerf Rival 18-Round Refill and 12-Round Magazine - Walmart.com