DO NOT SHIP VIA UPS. SHIP VIA USPS-POSTAL SERVICE ONLY.
Anything other than USPS will be ungodly expensive on both ends...
I recommend a double padded bubble envelope, or a single envelope AFTER you wrap and protect the book in bubble wrap.
Don't let the book flop around in the padded envelope (a large size 16x20 works well) but after protecting the book separately (with bubble or with another envelope) tighten the outer bubble envelope and seal VERY tight with LOTS of tape.
Trust me on all this...I shipped about 500 of them out!
The first group went out in a peculiar means where they were shipped as one mass shipment per country, and then dropped into the local postal services there. It saved about 50% or more over over the counter shipping. You cannot do this with one-off packages.