It is a very dangerous thing to do! No more saying, "Nope can't buy that, won't fit in the suitcase!" Does weird things to the credit card balance.
Seriously, we have shipped many things back from the last three trips, including two entire monorail systems and art work. Most stores will do it. In fact, there is a cute kiosk where you actually create your shipping labels. We actually tested it out for the cast members at one store. It had just been installed. Everything has always arrived in perfect condition. And, it is not all that expensive either. I think the only thing we couldn't ship was wine from the German Pavillion. Something to do with Florida laws.