If you would like to see some guidelines for shipping live reptiles,
Superior Enterprises has some pretty good information. Shipping with heat-packs
can be very tricky, and keep in mind that the smaller the area to be heated, the more efficient they are. The idea is
not to keep the reptile at it's 'ideal' temperature, but rather to keep it from freezing. It is better to err on the side of a little too cool than too hot... as overheating can cause death and reptiles can recover from cooler temperatures more readily.