For anyone still looking for info/confirmation on lightsaber shipping:
It's $18 ground (8 to 10 days) or $36 air (did not get details, since I did ground shipping). The delivery is made by USPS, and Disney will replace anything that's broken on arrival. They've had issues with USPS leaving things on doorsteps even if instructed not to, so if you have the option of shipping to your workplace or somewhere else with secure delivery you might want to do that. Also, I had kept the lightsaber after the build so I could get photos, and returned with it to the park about half a week later to ship it. I went to Dok Ondar's because I wanted to buy a hilt stand (regretted not getting it as part of the package at Savi's), and they were also able to arrange shipping for the lightsaber from there. I had my Savi's receipt with me, but they did not ask to see it. I was able to have the hilt stand shipped with the lightsaber at no additional expense.
Dok Ondar's was pretty busy every time I went in there, so if you aren't buying a specific item there you might save time by having your lightsaber shipped from a different shop. The First Order shop didn't seem like it got too crowded most of the time, but I don't know that I would have felt right handing my lightsaber over to the First Order!
I had a reservation for 10:00 on Saturday, January 25, and I was actually pretty annoyed that they seemed to be taking the standby line at the same rate as the reservation line when the reservation line was actually a bit longer than standby--what on earth was the point of having a reservation?? I guess depending on the day you might end up with an advantage if standby gets very long, and it might be different in the evening, but in my experience it was not particularly helpful. On another morning later in my trip I dropped in at DD around 7:15 to look at accessories and there was no line at all on either side. Also, the conveyor belt and build stations didn't have crowding issues like they did during my build, so if anyone is going early to get a BG for RotR and not planning to RD Smuggler's Run, I'd highly recommend going in and building your droid first thing in the morning. That was also a great time to go to Oga's; I made a reservation for 8:30 on the fly that morning but showed up at 7:30 and got let in early (if I hadn't been solo, though, they might have made me wait).
100% glad I had a reservation for Savi's, though, zero question that it let me skip what would have been a very long wait.