Through the month of December Speedin' Motorsport will have all of their BMC air filters on sale.
All you have to do is pick your air filter from the site and use the coupon code in the shopping cart.
The link to the air filters -----> Speedin' Motorsports
The code----> MRABMC2012
Or
You can always call Brian @ 505-215-0985 to find the filter or any other parts you may need.