You could cut out a baffle to mount it to so it doens't flop around in the cardboard box when shipping. Then use packing material (like newspaper) around the whole thing.
NEW B Series Subs.. Bought new, 250W RMS, 350W Peak, they're Dual 4 ohm.
Have two of them, $50/ea or $80 for both. $15 S&H for one or $20 S&H for both.
Email for details or with questions cxixer@yahoo.com
friend of mine made a port calculator, it's more accurate and figures in for a correction factor and all. pretty much everything's been done already, but if you'd like to discuss more in detail, email me at sales@able-audio.com