For some strange reason clip copy holders are hard to find in Thailand where I live so I made my own for less than five dollars. The clip copyholder below is cheap in the US but hard to find and expensive in many Asian countries.
I bought everything I needed at a Daiso shop in which everything is 65 baht or around two bucks. Daiso has stores all over the world. Buy a plastic clipboard
Buy a plastic plate holder
Glue the plate holder to the back of the clipboard
I used plastic acrylic adhesive as opposed to super glue since it’s less forgiving if you make a mistake since the bonding is slower but super glue would work as well. Plastic on plastic tends to create a stronger bond than plastic and wood so use a plastic rather than wood clipboard.