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Make your own ;)there are a lot of youtube tutorials for good methods
You can also glue the bow in shape, by constructing a wooden frame with holes along it for clamps. Make the frame a little thicker than the bow, in the shape that you'll ultimately end up with (slightly curved arch), then apply the glue like butter, and clamp the bow along the frame. If there is a part where no glue squeezes out, you just apply more, then leave to dry and continue construction [source, (basically just shows what I typed but with better terminology) https://youtu.be/-qdLw79_JUM]
Pretty much any hardwood would do for the primary construction (yew, lemonwood, hickory, oak, are the most common i believe). I think for the back part, you can use bamboo, which is less traditional but functions well. See my other comment for the youtube guide