I often just get laminated sheets of construction paper or other paper. That way if later I need them for something else I can just write on them with a permanent marker and they are ready to go. Anything laminated can also be written on with a wipe off marker, so I do this for my kids calendars as well and that way I can reuse them.
I know of several homeschoolers who like to laminate worksheets to use with wipe-off markers. As long as you have copyright permission, this is a great thrifty tip. You can re-use the same page over and over with multiple children, or even with one child who needs repetition.