If you're interested in providing some low-cost distractions* for the children of investigators who may be caught under-prepared to entertain them during Sacrament meeting (and other Sunday Church meetings), back-to-school time is ideal... Most stores that sell school supplies have "loss leaders" (several ridiculously low priced items that they advertise to get your attention!). Crayons, colored pencils, and wire-bound lined paper are usually priced very low. All of these things are great for keeping young children busy - and hey, if you're going to buy them, you might as well buy them while they're very cheap! I stocked up on packs of crayons for 20 cents each, boxes of colored pencils for 89 cents, and wire-bound notebook paper for 15 cents each.
If you make "Welcome to the Ward" Packets**, plain-colored pee-chee style folders can be found for low-prices at this time of year also (I found them for 15 cents each - they are close to $1 each the rest of the year).
Don't wait too long to shop, though- retailers usually raise school supply prices back to normal the week or two before school actually starts...
*For more ideas, see the post from July entitled "Entertaining visiting children / Sacrament meeting" under the topic "Fellowshipping (at Church)" at the right side of the page.
**For information on "Welcome to the Ward Packets," see the "Welcome Packets" section at the right side of the page.