I look around for garage sales and try to find old wooden slat window blinds. I picked up some six foot wide by seven foot tall 3" wide wooden blinds used for sliding doors. Only paid $3 for six of them. The wood is very stable and smooth. Not sure what type of wood it is but it looks like teak. I just cut them apart and then run the 3" wide blades through my table saw with a fine tooth blade. I have used the slats for siding and they hold up very well outdoors with just a clear coat.