I got them from FastGuys.com.
** Note ** When you order the rear shocks, order the one for the 135i. The 328xi utilizes the same rear shock as the 135i and 335i. Also, Aparently these shocks are quite popular thus are on Back Order till the first of the month. I figured I've been waiting this long, what's another week and a half!
Here's the details...
Koni Shock - Sport Yellow - BMW 135i(2008+), BMW 128i(2008=) Position: Rear 8240-1236SPORT $127.13
BMW 08-11 3 Series - Sedan/Coupe, Xi AWD Models - Sport (Yellow) Left 8741-1535LSport $180.00
BMW 08-11 3 Series - Sedan/Coupe, Xi AWD Models - Sport (Yellow) Right 8741-1535RSport $180.00
Tell Andrew that Darryl Sent you!