Why go to a dollar store to stock up on one subject notebooks when you can get the same thing at Staples for 17 cents when they are on sale at Staples? For the price you can't go wrong and you don't need to be a kid going back to school to need them. I buy different colors to coordinate them with different projects I'm working on so I know that all the color red notebooks deal with project "X" and yellow notebooks with project "Y" etc. The paper isn't archival quality but my intention isn't to have these notes last forever.
I recently bought several of these notebooks at an exceptional price. I teach at Santa Barbara City College and like to have extra notebooks to give to students who are low on funds or as a prize for answering questions or completing an assignment. The back-to-school pricing makes it possible for me to do this. In addition these notebooks work very well for the journals I require my students to have for my writing class and they hold up for the entire semester without falling apart as many inexpensive notebooks do.