Thanks for the help! I also looked at shipping through USPS, but my google-fu isn't as good as yours. Kudos to HIkin Jim! The link is really useful, except that I have a bit over 3 liters. If I had time I could probably spread them over four mailings. I doubt they'd accept four boxes at once, though.

You're right that I am not driving, so I can't use the obvious solution.