Coen Engelhard makes wonderful bows in the South of France.
The bows are made out of Acacia wood. They have a nice articulation and a direct, focused sound emission, are stable on the string and pleasurable to hold. They pair perfectly with Renaissance model instruments, but can also lend agility and a more appropriate sound to earlier repertory on a more baroque-style instrument.
The bows are all made of abundant local wood, so you could call them sustainable.
Prices are between 500 and 800 euro. Bows can easily be sent in a tube by post.