I paid $259 + shipping.
http://www.circlebmw.com/parts/acc/65110403650.htm
I did get a quote from the local dealer of $595.
I plan to ask the dealer just want additional information in my back pocket in case the billable time was more than 2 plus hours.
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2011 / 335is Coupe (M Package) / AW / Blk Dakota Leather / Conv., Cold Weather & Premium Packages / 6-speed MT/ I Drive
Retired
07-335, 04-325, 98-323ci, 80-320i, 79-635CSI