You may already be aware (not sure if you're looking for new or used), but ECS Tuning has them available on their website for around $230 or so (brand new).
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2014 328i 6MT | silver metallic/black dakota | m-sport | premium | navigation | heated front seats | performance kidney grille
Sold: 2014 F25 X3 35i | 2011 E90 335i
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