I ship/receive unrooted cuttings a few times a year - next day air and a thermos. Submerge the cuttings completely in cold water, completely filling the thermos, keep in fridge overnight. Put the lid on in the morning, ship 'em out next day air - when they arrive the water is almost chilly still! Plus you can send a ton of cuttings that consist of two or three clonable sections each - virtually guaranteeing survival