This is a step-by-step guide on how to create the single greatest DM screen anyone could ever own. It is cheap and simple. A 10-year-old can make this. (Although adults will generally make less of a mess in the process. Also, I swear, so 10-year-olds definitely should not read this guide.) To begin, go buy yourself a pack of paper report folders. I chose black because I'm metal as fuck.
Take out two of them, open them up, and put their edges flush. make sure they're both right-side up and facing the same direction. Duh.
Use the perfect tool, duct tape, to stick them together. Leave a little gap on the tape, so there's room to fold it over without bowing the pages. A ~1mm (or ~1/16") gap should be good. Don't tape the folder slot shut, note the gap in the tape on the inner side in the following picture.
Now go get a bunch of plastic cover sleeves. You will also need a strong, fast-drying adhesive. I used 3M Super 77 spray adhesive. (I wouldn't recommend it- it makes a fucking mess. Same goes for crazy glue. You should use two sided scotch tape, or a glue runner. White glue and liquid glue can't adhere to the plastic, so don't bother with those.)
Don't forget to glue them open-end up! It may seem obvious, but these things have very subtle edge differences that can be hard to notice.
Print off some nice stuff for the players to look at and drop it into the slots! I chose a couple of funny memes and two pages of table rules.
Gather your game notes and other supplies, like a stack of pregens, a book of graph paper, and your adventure plan, and dump them into the folder slots! Pack your dice and books and head to the game, 'cause you're ready to rock!
If you're looking for something a little more sturdiness, but the same desgree of functionality, take a look here: