If you have some pretty simple tools it's not terribly difficult to make your own. I recently experimented with some Sitka spruce I milled in my backyard and am really happy. I have a hunt planned later this month that I'm prepping for. There are a lot of resources online for making your own. But the basics I gathered were 1/8" this sound boards and 1/4" thick paddle. Make sure your grain for the sound boards is horizontal and the grain for your paddle is vertical.
