Here is what I did. Purchased a set of 211's off a guy in las vegas. The rims were in excellent shape and it cost $250 a rim shipped. Purchased some Pirelli Scorpions from Discount tire becasue they matched Tirerack. $1123.35 so 2123.35 for a winter set. My E53 set lasted me 3 winters before I sold them.

example:
BMW X6 X5 19" OEM Factory Wheels Tires: eBay Motors (item 110598635934 end time Nov-13-10 12:46:50 PST)

sell the rubber on craigs list for $100-$125 a tire.

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2012 X5 50i ZAP(2VA, 336, 465), ZTP, ZPP, ZPS(6VC), ZCW, ZRC, 322, 4UB, 4NC, 610
2011 ///M3 Silverstone II
2011 X5 50i(lemon)
-- SOLD --
08 550 Msport
07 X5 4.8I sport
04 545i sport
02 4.4i sport
01 540I M/sport
00 SL500
97 SL500