I think I used bikeflights.com for a hybrid, and for a smaller "trick" bike with 20" wheels. Worked ok, iirc. Make sure that the bike shop takes some pics of this AS they pack it, and of the box before it leaves. And when you get the box, take a pic of the package, intact, and also as you unwrap it. Turns out you need these to make a claim if there's damage.