Munchkin has released a new $1.00 off any Munchkin Click Lock Cup coupon. I believe the single cups run around $2.98 at Walmart, making them just $1.98 each after the coupon.
Munchkin also has a great promo going on the next few days. Through 9/25, they will be giving away 100 FREE cups at Noon EST each day over on their Facebook page.
If you win one, make sure you come back and let us know!