Recently, I found $1 while I was going to my car and put that amount in the coin can at the Reference Desk so it could be used there as needed.
Today, a long-time student (currently in-between semesters) was signed in as a guest and needed to print a page. Rather than make him buy a guest card to print 1 page, I used change from the coin can and put $1 on the copy/print card that's in the ref desk supplies.
Hope what I did is okay.
-- Cathy W.