probably ebay or amazon for cheap stuff, or you could run over to greer..... jk
search online "BMW part#here" and a list of providers and prices are available for OE emblems, wouldnt be surprised to find it at a different dealer for a bit less.

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03 3.0 Alpine/Blk (sold) Sport, Prem, CWP, PDC, Xenon
10 35d Titanium/Blk - Sport, Lux Seating, Prem, CWP, Tech, Rr Climate, CA