I used to have textbooks beneath my computer monitor, but I sold them to get some money back. Now my monitor's several inches too low. Instead of paying $40 for a new stand, is there a way I can make my own? I was thinking a phone book would work well but I don't have one. I have old shoe boxes but I don't think they're strong enough.
Newspaper will work. It has the added bonus if being easy to work with as well as controlling the resulting height.
You said you had books, maybe you can get some inexpensive books to put back there. Old phonebooks of previous years may do the trick - they are tick and after a couple years nobody wants them anymore (as they are outdated and there are newer versions anyway).
Use ream(s) of printer paper. Stable, scalable, you already have them lying around your computer area.