Here are a couple of them:
Weekly Chalkboard Decals for $14.99
Chalkboard Wall Decal for $8.99.
I have chalkboard wall decals in several rooms of our house. I have a larger one in my kitchen where the kids practice math & spelling while I cook our meals. I also have the dotted line ones that I have in the kids’ rooms. I’ll write a word on the top one and then they have to write it on the lower one. Great way to practice writing and spelling!