Essentially you just need to get a 6 ft board from the home improvement store, stain or paint it the color of your choice and then adhere these little vinyl stickers on.
(Note: I am not actually 6 feet tall. The measurements start 6 inches up on the board to accommodate the few inches off the ground from how you hang the ruler. Otherwise when you child stands next to the board the measurement would be inaccurate.)
So you will need to get the board (mine was $10) and get the paint or stain and then you can buy the vinyl in your choice of color and style for $13.99 + $4.99 shipping.
If you have a Silhouette or Cricut machine you can cut this yourself (I found free cut patterns on Pinterest). I will say I am a semi-clumsy Silhouette crafter and I wasted a lot of vinyl and had to redo the cut twice 🙂 So honestly in retrospect I spent $10 on the black vinyl and probably 2 hours on this project doing it myself. If I was to make one again I would probably just buy the vinyl and call it a day 😉