Turn a cup into a sippy cup with these silicone lids from Boon. These are priced at $5 right now (reg. $9.99). These are the lowest price so far, but please remember prices may change.

• Easy Transition: This Snug Silicone Lid turns the cup into a sippy cup
• Spill Proof Design: Prevents spillage and helps to keep the drink inside the sippy cup
• Adjustable Sippy Lid: Stretches over most cup sizes from 2.5-3.75 inches in diameter
• Easy to Clean: Flexible sippy lid is easy to use and dishwasher safe
• Made without BPA or PVC
• Turn any cup into a sippy
• Spill-Proof