Rob @ RK Reptiles
ballpythonmorphs.net
Also if you have a UPS account you can purchase UPS boxes in many different sizes and make your own Styrofoam lining as I do. When you use their boxes you automatically get only charged by weight and not Dimension as on larger boxes. I mainly use 10x10x10 and 12x12x12 boxes and most of my shipments run $24-$32.