C3Z is Tanzanite Blue - perhaps the M = metallic. BMW touch-up is here:
https://www.bmwpartsdeal.com/parts/b...912465727.html
You should be able to get/order it from BMW of Fairfax ($38 online price) or Sterling ($46 online) if you're in NoVA. They say can't ship it (contains hazardous materials), but BMWPartsDeal.com doesn't seem to have an issue shipping it.
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2015 BMW 228i in EstorilBlau II Metallic / Terra Dakota Leather - 6-speed manual, M Sport Package, Cold Weather Package, Lighting Package, Premium Package, Harman Kardon premium sound, Anti-theft alarm system, Blue Metallic Matt Accent Moldings, Aluminum Hexagon Interior Strips, Anthracite Headlining