I sold my '09 335i sedan last week, and I am left with my Burger Motorsports Plug 'n Play JB3 (with Bavarian Technic diagnostic cable). I have 100% positive feedback on ebay (username: Bri1010), so you can buy with confidence. The JB3 was on the car for about 2 years with zero problems. Feel free to ask any questions!
I am asking $200 + actual shipping