I'm not sure about Canada but Fedex Ground is by far the cheapest to ship within the continental US.
As for packaging, cut out pieces of circular cardboard larger than the diameter of the wheel but smaller than the diameter of the tire. Don't put the cardboard directly on the wheel because it will create marring, especially on polished lips. here is a great diy
http://forums.audiworld.com/showthread.php?t=1568668
you can use something like this between the cardboard and the wheel face
http://www.uline.com/BL_864/Foam-Sheets
I've also used blue easy release tape on the edges of mirror polished lips in conjunction with the padding and cardboard.
Instead of wrapping the whole wheel/tire in saran wrap I've used enough packaging tape to ensure the packing materials won't come off during shipping.