Just returned from Colorado on a muzzle loading elk hunt. On the route out and back on Hwy. 70, while in Kansas I began noticing along the road a LOT of green balls hanging from trees. A stop and short walk found the green balls to be Osage Orange. Hwy. 70 in Kansas (both sides of the road) is littered with Osage.
Traveling through Kentucky on Hwy 64 also found a lot of Osage trees from Louisville to Ashland.
It was torture to drive by all those trees and not able to collect a few staves. If you reside in those areas then now is the time to try and locate some Osage. Just look for the green balls.
Good Luck