I have had ongoing success and satisfaction with ULINE the shipping supply specialists. While I am lucky enough to work in a box factory, I often purchase various jars and plastic containers from them. Their insulated shipping box kits are outstanding. They have the best prices I have found yet on bulk cold packs.

Check them out, you will be amazed how much useful stuff they sell that is perfect for the exotic pet enthusiast.

I recently purchased a bunch of these excellent jars to use for culturing live foods, specimen containers, and "holding cells", while I am cleaning tanks and cages. A bit of work with a drill or a soldering iron easily adds ventilation.

They generally sell only in case amounts on most items, but for those of us in the habit of shipping critters and related supplies a lot, this is not an issue.