tads are relatively tough little creatures. they can be shipped as you would ship live fish or shrimp. in a kordon breather bag. but as with any shipping of live animals, regardless of what they are, you must factor in "the human factor". boxes getting tossed around, flipped upside down and what not.
i used to breed and sell shrimp years ago and used kordon bags. they are excellent, but the human factor probably cost me more money than anything on refunds and replacements due to boxes getting mangled during shipment.