Insulated boxes.

[Robyn@SYR]

Also a source of inexpensive boxes, true. However, keep in mind the dimensional weight of such a box.

If you are shipping a small reptile, which is most common, actual weight may be only 1 or 2 pounds, but dimensional weight, which is what you will be billed at, is going to be higher.

7"x7"x6" box dim weight- 2 pounds
12x9x6 box dim weight- 4 pounds
16x16x8 box (fish box size) dim weight- 13 pounds

There is a HUGE difference in cost between shipping the first box, as compared to shipping the fish box, even if they physically weigh the exact same.

(Dimensional weight is calculated by length x height x width, divided by 166. They use lasers to measure each box in the system)