I bought pre-mounted tires and rims so I could swap the wheels myself. They could have been shipped to my house but I found out that Tirerack has a distribution warehouse in Denver, about an hour away, so I picked them up there in the MX (yes, all 4 wheels fit in my 6-seat X).
If you buy just the tires, Tirerack will give you a list of local shops, who they partner with, to do the mounting and balancing.
Just Ordered a set of Winter Tires & Wheels from Tire Rack. Paid ~$250 for TPMS sensors. Called their support to get part #. It’s a Continental 1034602-Mod. They tell me I will get instructions with the tires on how to setup TPMS sensors.