What I did was go to mailboxes etc, and buy a cardboard box that was big enough for what I needed. I then bought a piece of sheet styrofoam they sold. I cut the foam to fit inside and lined the whole box. It worked out fine, and everything got there safe and sound. Just make sure you buy a box big enough that after you line it, It will still have foom for your animal. It cost about $6.00 for the box and foam. Cheers, evan :Try Superior Enterprises at the link below. If those boxes are not big enough for you, try calling a few rodent breeders for their sources. They also use insulated boxes.