Dunno. I only know how much I spend each year.
I have begun the annual spree. At Office Depot I dropped $118, and Target another $10. It's not even September yet! I buy donuts for some classes, candy for rewarding answers and participation SeaWorld-style (like when the trainer gives the sea lion a dead fish for barking on cue). I haven't even been in my classroom yet to know what else I'll need--well I know I need a new CD player--, but fifty cents for a comp book is a great bargain, and I like to hand some out on the first day to kids who raise their hands first, just to show them that engagement itself can be a reward.
[Some years I spend more than others. Last year I sent away for a talking Thomas Jefferson doll (http://www.youtube.com/watch?v=rCsuzAsMCto). I put him in the closet and FORGOT I HAD HIM!! OK, so that was dumb. But this year TJ is in the house. Fo shizzle. I will be sure to post the day my presidential purchase makes his first middle school appearance!]