I've had more replies to this offer than I expected! I'll make a general reply here, and contact everyone who responded off-list.
I think the simplest and most cost-effective way to ship these is a USPS Priority Mail flat rate box. I have to wipe the drives before I ship them -- my word of honor to the sysadmin. I have probably a couple dozen done now that I can ship right away. The rest will trickle out a little bit slower after that. When I said "big carton" I meant it. There are plenty for everyone.