It may seem kind of silly, but gum wrappers - those plain white ones that wrap a stick of gum over the foil wrapper (from the large packages) - are just about the right size to jot a note or short list.
Save them and staple them together (or just keep a stack of them). Paper is paper is paper, no matter where it comes from.
That's good but something else you can do is keep peices of paper that you use only 1/2 of or less (for example, you used 1 side to print something that didn't turn out right)and use the blank side or blank parts to write something down that you are going to throw out anyways and may not need to use good paper for.
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