Cheap Whiteboards!
Take a large thick cardboard box. Cut it into planar pieces. Take transparent tape and cover the cardboard’s surface with it. Tadaa! A whiteboard:
Because transparent tape is smooth the whiteboard pen is erasable.
Sticky notes stick a lot better on the transparent tape than on the cardboard, which is useful for Kanban Boards!
Ideally, put white paper between the cardboard box and the tape to get an actual white board.
This method can be applied to convert any object into a whiteboard, like a big piece of wood, the side of a shelf, your forehead, etc.
(Originally my intention was to make sticky notes stick better, and accidentally discovered that I made a whiteboard. That’s why I did not use white paper.)
(I’m currently unsure if there is a problem with the pens becoming unerasable when leaving them on for a long period of time, or any other problems, as I just came up with this.)
Actual dry-erase whiteboard contact paper can be found for less than $2 per square foot.
Contact paper, clear or not, is another way to quickly and cheaply turn most surfaces to whiteboard. And it doesn’t have to be white if you want some variety. Markers do become semi-permanent if left on way too long; they probably will with tape, too.