Don't know where you're located, but look in the yellow pages under packaging materials and find a full-line supplier. There are many standard box sizes that will work, add 4" to each dimension and pick the closest one. Look for at least a 200# carton, preferably 275# doublewall. Then get a big roll of 1/2" thick bubble wrap and start wrapping til it fits. Probably cost around $40 total. BTW, these subs are supposed to be shipped upside-down, so remember that when you put the address label on.