Saddles are generally made of plastic, bone and Tusq, ivory. I have updated saddle on my martin guitar to a bone saddle, earlier it was plastic one, There is significant sound difference. You can immediately feel the warmth in sound, and surprisingly my guitar is not getting out of tune as often as it used to be.
I have bought my saddle from
https://macnichol.com/ you can try them, they do provide good customer service and wide variety.
