My family keeps the tires on separate rims so the tire beads don't wear out from mounting/dismounting.

If you look around on the internet like on Craigslist, you can find a good deal on winter tire/wheel package.

My rims and tires were on a local Craigslist for $1000 from a wholesale car dealer. Driven only for 100 miles and were pretty much brand new.

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2008 BMW Individual E66 750Li (Azurite Black Metallic/Rust Brown Merino Leather)
BMW Individual Composition Package
Luxury Seating Package
Convenience Package
Adaptive Ride Package
Comfort Access
HD Radio
Night Vision
Active Cruise Control
Rear Ventilated Comfort Seats
Rear Entertainment Package
2006 Mercedes-Benz S500 W220 (Flint Grey/Charcoal Nappa Leather)
Keyless Go
Electronic Trunk Closer