If you do an internet search( google) under violin pegs, you get all kinds of sources.
If you know an instrument repair shop, that works on violins, and other string instruments, the repairmen often have a box of worn or broken pegs they have replaced. I bought some from a local repairman for about $.50 a piece, and he was glad to take my money. Then he asked me what I was going to use them for, and was inpressed. Its was not something he had ever considered. Turns out he did some shooting and small game hunting, and was not anti-gun at all. He enjoyed meeting someone who was into ML rifles.