This is what we take to shows.

Small one....



Big one....



We also use these around the house to hold a snake, some rats, whatever while we clean enclosures, to take an animal to the vet, pretty much a ton of handy uses.

You can find these just about anywhere from dollar stores to Walmart, etc. for only a few bucks each. They have good latched lids and a handy carrying handle. For transporting a snake you can put some aspen in there and for extra security a small pillowcase or snake bag to hold the snake. You could put a label on it with your name, buy the snake, secure it and then either carry it around with you or leave it with the breeder for later pick-up if your comfortable with that.