It's hit or miss mostly on where you can buy it I can get is from a Canadian hardware store that tends to carry every type of wood. I would say start looking in your yellow pages and phone any local wood working shop or supplies stores and ask them if they might carry it or know were you can get it. I prefer to buy my base products in person.
I pretty sure they carry wood in store as well as hard to find fixture for trunks and stuff (ordered from the before)
Birch is what most prop makers use for display swords since it’s easier to carve like pine.