Tire Rack sells decent 18" winter package options (check the e90post wheels and tires section Gary@tirerack)
Otherwise, it is Canadian $3,600 for the Style 446 18" with ContiContactSport Run Flat
The M Style 467 is $4,400 19"
Both prices are a rip honestly, you can get one from Tire Rack for 1/3 the BMW OEM price
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