The root of all evil... but you can call me cookie.
I don't know if this is the case but perhaps they are on sale because they are close to or even past their expiration date?
I checked the packages on my lunch break and there's not an expiration date on them. I really can't imagine what impact it would have on a polymer clay to have a expire date even if it did. *SHURG*
Besides this appeared to be just like all of their normal signage that they get from their corporate office to use as a sale sign.