Amazon has this, Nerf Modulus Strike and Defend Upgrade Kit for $6.26 (reg $15.99) with free shipping on qualifying orders of $25 or more.
Strike and Defend Upgrade Kit lets you upgrade your Modulus blaster (sold separately)
- Blast shield protects you
- Thousands of combinations with the Modulus system (other kits, accessories and blasters sold separately)
- Includes blaster stock, blast shield, 2 darts, and instructions.