[cle]

Use whatever's lying around. Some more ideas:

  - A shoebox
  - An old binder
  - A food container
  - Some coasters
  - Egg carton
  - Jenga blocks
  - Cereal box
  - Legos
  - Picture frame
  - Tennis ball (cut it in half)
  - Door stoppers
  - Cake pan
  - A screwdriver box
  - A few junk mailer magazines
  - Crumple up a couple newspaper pages

Or better yet, order one of these and make 3 more with the shipping box it came in. That'll help once it wears out, or you accidentally sit on it.

[toast0]

Not sure how many cereal boxes can hold a laptop... unless you're stacking them flattened, and then you need to eat a lot of cereal, but you can adjust height very precisely. :)

[redundantly]

A cereal box is likely thicker than the material used in the product this article talks about. It wouldn't take very many folds to prop up a notebook.