Amazon.com: 100-Pack of Foam Ball Ammo Refill Replacement for Nerf Rival Guns - Compatible with Nerf Bullets, Darts, Hyper Balls, and Rival Balls for Worker, Perses & Other Nerf Gun Models. :
Amazon.com: NERF Rival 50-Round Refill Pack : Toys & Games
Amazon.com: NERF Rival Round Refill, Pack of 15 : Toys & Games
Amazon.com: 200 Rounds Refill Pack Balls Ammo Compatible with Nerf Rival Gun, Upgraded Foam Bullets Balls Refill Pack for Toy Gun Blasters : Toys & Games
Amazon.com: NERF Ner Rival 100 Round Refill : Hasbro: Toys & Games
Amazon.com: 400 Rounds Refill Pack Balls Ammo Compatible with Nerf Rival Gun, Upgraded Foam Bullets Balls Refill Pack for Toy Gun Blasters : Toys & Games
Amazon.com: NERF Rival 50-Round Refill Pack : Toys & Games