New - aluminum masts. 25% the price, only 25% weight penalty

https://projectcedrus.com/cedrus-development/engineered-aluminum/

You still need to buy adapters, etc, though, but great option for brands where carbon mast is the only option, if you want a cheap, short alu for OBX and use the longer carbon Cedrus elsewhere; or need to drill a mast for an efoil.