Last week there was a rash of in-store freebies and now it appears that this week is all about the coupons and rebates. If you have a cat in your home, check out this rebate form for athat's valid until Dec 31, 09. They'll only reimburse up to $5.99, so make sure you're not paying more than that at the store.
If you don't have a cat, you might consider donating the litter to your local animal shelter. See, whoever said freebies can't be used for the greater good of society?