[rick lester]

I would think making your own wouldn't be that hard. Assuming the car already has an electric pump, get a big enough cooler, drill 2 holes, run 2 lines back and forth in cooler, fill with dry ice, hook up to car, turn on electric pump and BAM, got yourself a much cheaper cooler. Bolt on wheels or mount it in a custom cabinet on wheels that doubles as a toolbox/small workbench that can be rolled around in dirt, grass, on blacktop, anywhere you need it to go. Also, if you can weld aluminum, you can make your own. Possibility to use a motorhome/travel trailer fresh water tank mounted under trailer with access hole to fill with dry ice or bag ice from the track. I would run lines in it, access in trap door in trailer. When done, empty tank, no major added weight other than tank and lines, and I'm sure there is a tank built to fit under enclosed trailers to be used for that. I might be overthinking this but there are probably dozens of ways to do something yourself.