From MINI PR:

MINIUSA announced a reduction in pricing of SIRIUS Satellite Radio receiver kits at BMW centers and MINI dealers across the country today. New car buyers of the BMW 3 Series and X5, MINI Cooper and Cooper S, will be offered a center-installed SIRIUS receiver kit for a MSRP of $395, plus installation.

“We are committed to providing our loyal owners with added benefits and value at a competitive price,” said Alan Harris, Vice President, Aftersales Marketing and Sales for BMW and MINI. “SIRIUS is a key component of our vehicle accessory strategy for all BMW and MINI models; and by providing this option at a reduced cost, we plan on turning even more BMW and MINI owners into SIRIUS fans.”

This is probably long over due when you look at aftermarket pricing.