Amazon has the Munchkin Click Lock Bite Proof Sippy Cup, Green/Pink, 9 Ounce, 2 Count
For $3.84 as an add on item.
Set of 2 BPA-free Sippy cups with 9 ounce capacity for water, milk or juice
Soft, bite proof spout – guaranteed
No room for error – locks in place with an audible click
Easy-to-clean, one-piece valve
Top rack dishwasher-safe, 9 Plus months
