just wait-if you ever move from your current dwelling they will appear in droves. when we moved last year i started out with a shoe box that i started tossing all of the pens, pencils, erasers and other small school supplies into that i found while packing. well, by the time i had cleared out the kid's rooms i upgraded to a cardboard file box

i found hundreds of items squirlled away in toy boxes, underware drawers

under the bathroom sink

very few in the actual drawer they were SUPPOSED to be store in
if you're in need of pencils in particular, hit the stores after a holiday and get those decorated ones that come in packs-
walmart had one's with hearts on 75% clearance the other day, and they've got tons with easter themes they'll be sure to be clearing out next month.
nothing encourages an adolescent boy to keep track of his school supplies like the threat of having to resort to using mom's supply of 'i love you' and easter bunny imprinted pastel pencils