I used Rust-Oleum Chalkboard spray paint for this board. This paint was easy to use and was less than $5 at Home Depot and I still have half a can left after 3 coats.
I personally didn’t use a primer so I saved a bit of money there but because there isn’t a primer I have to be careful not to scrape any of the paint off.
I also made a daily menu board:
The idea for this menu was stemmed slightly by this post here: