I have shipped my wheels before, to travel, and ground shipping has always been around 40-something dollars, depending on zipcode, for the dual box. I think the single box that holds two wheels costs a bit less to ship. The only carrier I use is FedEx, so I do not know if others may be cheaper.
Yes I always get boxes at the bike shop, normally they throw them away, but they do know that a few of us ship their bikes and stuff when we travel, so they got into the habit of keeping the boxes for a few days before the discard them.




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