http://www.crayola.com/colorfullearning/
You must register as a educator or homeschooler, then you can register for Crayola's Centennial Celebration sweepstakes. (You can register for the site in general even if you're not an educator, you just can't register for this contest and get the freebies.)
Everyone will get a sample pack of goodies. I got mine today. It is:
2 Gel FX markers
6 short colored pencils
4 of the Construction Paper crayons
Red, blue and yellow tempera paint
Red, white and blue glitter glue tubes
Washable glue stick (full size)
1 pack of white Model Magic clay
Commemorative pin - it's crayons sticking out of a crayon box. Okay, they look like colored french fries in a french fry box, but it's still really cute
The site says nine samples, but it's really only seven. But still, for free!
When you register, you are also registering for their big contest, and the 4 winners there will each receive a Grand Prize Crayola Centennial Celebration gift pack, including $600 worth of Crayola products and a digital camera (ARV $400). You can actually register more than once, but additional entries must be made by postcard. (I doubt you'd get more sample packs, though.)