Here is some information on bow wood's and their suitability for makeing bows. This is from Tim Baker, who is one of the best authorities on the self bow.
https://sites.google.com/site/onemississipp/bowwoods
I had good luck with Maple board bows for kids, and for adults when under 50#.
Osage is hard to get here, as are any good staves, but Osage is my top pick, followed by Hop Hornbeam and Hickory. I made some Ash bows that came in light weight, but shoot good.
Red Oak Board bows can be good too , but I realy prefer to use a split stave.
here is a source in canada for some staves. I have not used this place myself.
http://www.amwoodinc.com/productDeta...JZ0jifOw%3d%3d
It would probably be expensive to ship a single stave, but a group purchase might make it worth while. I paid $90 shipping a couple years ago to send 8 staves by Greyhound from New Brunswick to Edmonton.
If you buy staves state side make sure the bark is removed!! or it will not get past customs.
saskatoon can make good bows too, but it is known for twisted grain. look for 1" to 1 1/2" stems.
Pete