There are really only three materials required.
Materials you need to buy
- A pane of glass
- An illustration board, or similarly sturdy/thin backing like chipboard.
- Presentation clips
Materials you already have
The price of these depends on the size of the poster. For me, the glass was about $6 at Lowes, the illustration board was $3 at a local art supply store, and the presentation clips were about $3 for an assortment on Amazon.
You should really decide what size glass you need before you go pick it up. Most places will cut it for you very cheaply ($0.25 where I went). I didn't do this and cut it myself with a hand glass cutter, which is not nearly as smooth or accurate as the guided cutting systems they have at hardware and craft stores. You have been warned.
Presentation clips are just silver binder clips. They're a few cents more and I thought they looked nicer. You can use any sort of clip like this that you want, but in my opinion silver looks better, and the profile of presentation clips lends itself to this application. Also, I bought a variety of sizes and found that the "mini" size by Acco worked very well - it held fast and is small enough to not distract from the poster.
- Glass cutter (see note, I recommend against this)
- Matt cutter
- Picture hanging hardware