Small Network Equipment Shipping boxes


Where I work we ship our own gear.
That being said, we've run out of 1U shipping boxes for cisco gear.

I've searched the list archives, uline, as well as a few other
shipping material websites and cannot find an acceptable shipping box
with foam inserts.
I would like a corrugated cardboard box with foam supports for
shipping 1U cisco gear (3550s, 4948s, etc..)
I was wondering if anyone has sourced a good shipping box?

I apologize if this topic has been brought up before and my search
didn't find the thread.