Yeah you're not gonna find much.... BMW doesn't make any (the ones they do make for LCI are for non-M sport).
For a lip, you could do the BMW Performance one. Here's my DIY: http://www.e90post.com/forums/showthread.php?p=10435521
On my car:
2011 BMW E92 335i, 6MT, Le Mans blue - Quaife LSD, JRZ RS Pro, JRZ camber plates, Eibach ERS, full M3 susp, custom toe arms, Powergrid end-links, SS brake lines, brake ducting, Michelin PSS, UUC SSK, ETS FMIC, ER CP, Perf. Exhaust, VAC RSIK, Sparcos; work by VAC Motorsports in Philadelphia