Sold out rn, but I am a big fan of XOAR propellers. I have used several of their prop sizes ranging from 16" to 24" - so I assume the 15" is of the same quality. They do come at a price - but I will happily surge on props for the utmost quality and efficiency.
As @JDeForest mentioned above, T-Motor is also a great source for carbon fiber propellers. My top three sources are as follows:
XOAR
T-Motor
KDE
All three vendors produce well-balanced and highly efficient propellers. So I just go with the source that provides the best diam/pitch combo for me. KDE propellers are the most expensive of the batch - but I believe this is because they are 100% manufactured in the USA (if i remember so correctly).
Hey Gal. Just wanted to let you know that the push type propellers are meant for aircraft that have the motors mounted upside down. There are some slight differences with the propeller design - so just wanted to make sure you were buying the correct version.