1 stop mold shop

I saw an ad on a local classified website of a guy selling carbon fibre bits and pieces for cars, stuff like splitters and diffusers. He says in his add he imported the molds from the UK. It’s a very popular trend amongst BMW 3 E92 series drivers. But it doesn’t replace an existing part. So it’s very difficult to make a mold unless you have an aftermarket part to work from. Do you get companies that specialises in mold making and supplying? I searched for threads on the forum but can’t get any info, neither any Google searches. BMW started to sell these add on, but at a ridicules price, I don’t think it’s something that comes out of the BMW factory because the quality is horrific. It’s made from polyester resin and is full of spider cracks (for the trained eye). front splitter set $800