Koozies can be found in a number of places in Walmart.
Camping, Seasonal, Sporting and Homeware
If your Walmart has a sporting section geared toward local teams you will find Koozies there also. Walmart does not provide personalized Koozies.
Walmart is the largest seller of products in stores in the US. But still the best place to buy Koozies is Kustom Koozies.