Discussion item rather than listing a specific deal
Looked a bit around at Silly Bandz (shaped rubber bands). Cheapest I see out there runs about $2.50 for a pack of 12. I have not looked a lot at retail, but I understand that they are $5-8 per 12-pack and are hard to find in stores.
Dollar Days Wholesale http://www.dollardays.com/site.....erms=bandz
(requires registration) runs $60 for 2 gross or $100 for 4 gross including shipping. (I am putting together a large order to share with some friends).
Online Science Mall http://www.onlinesciencemall.com
has many at 1.99 per pack. If you are buying enough, the shipping costs gets spread out enough to bring it to the $2.50 range.
Amazon and its dealers are all over the place, some as low as $3.00 with free shipping. Don't trust the Google Shopping page results for Amazon dealers.