Provided it's not too hot, we usually just use plain old (used) bed sheets. Wrap around the hive and tie securely. Bees cann't get out. Wind blowing during transport keeps it from getting too hot. It's much cheaper than any type of netting. If you are set on netting, Walmart fabric dept. sells netting that will work. I've bought netting a year or so ago from them.
;)