Richmond Tree Stewards does a big giveaway in October: https://richmondtreestewards.org/tree-give-away-2022/

There’s several others in the fall geared toward native trees where you can get a few for free or very low cost.

The Dept of Forestry also has low cost saplings. (Edited to add link for Va DoF: https://www.buyvatrees.com/?s=Dogwood&post_type=product)

I’ve had great luck with Virginia Native Plant Swap on Facebook also. Might be worth asking there as well.