As a spouse to a public school teacher and a volunteer in said underfunded schools, the schools would be better served if you sent them the $1 (or more) directly. Then all the other hands aren't skimming off the top.
We gave two Costco cubes of Kleenex as a Christmas gift to our school. You wouldn't believe the effusive thanks we got. Donate a box of printer paper and you'll be worshiped for a month.
(Yes, I bought a lottery ticket yesterday anyway. No, I still have to go to work on Monday.)