I ship machined aluminum molds all over the world now. Primarily by USPS
Priority Mail. Since they are aluminum I am concerned about dings and dents
in transit. It happens. I usually wrap the molds in bubble wrap and then
pack in other packing materials to stabilize them in the container. Now
being somewhat of a harder I've always saved bubble wrap for the occasional
shipping I had to do as a communications contractor. Now I'm starting to
run out.

I'm not against buying bubble wrap, but the price at the local office supply
stores is insane. The flip side is its pretty reasonable on-line, but the
shipping cost gets the net cost back up there again. Other than hording air
in little plastic pockets like I have done, what do you guys that ship stuff
do to keep the costs down?

Every piece of bubble wrap that comes in is placed in storage boxes in my
office, but its just not enough.