Same Day Shipping if ordered by 2PM PST - USPS Priority Mail
What's the best way for YOU to ship this case?
Three of this size fits perfect in a Priority Mail Box - 1095 by USPS.
Plant matter shipped First class mail probably isn't what you want as it could take a week. Once you bump up to priority 2-3 day the boxes are free through usps.com. Just order online, they'll ship them to you for free.
Search "Pirateship" it's also free. You get USPS cubic shipping discount. Much cheaper than usps.com Click N Ship.