Walmart has the Ozark Trail 30-Ounce Double-Wall, Vacuum-Sealed Tumbler for only $9.74 each! You can choose from 6 different colors. This is great for both hot and cold liquids and it has a lifetime warranty.  To give you a price comparison, these are selling for $15-$30 on Amazon.

Plus, choose in-store pickup to save on shipping. Or, shipping is FREE when you spend $50 or more.