Wow, this sounds like a great deal if you have cats! World's Best is offering a rebate to pay you back (up to $12.99) for the purchase price of a 7 or 8 lb bag of their World's Best Cat Litter. You must purchase the bag of litter between today (7/27) and 9/25 and then of course complete the rebate form here.
For those in the Sioux Falls area, looks like HyVee carries the product along with a few other locations. For additional locations and for those outside the Sioux Falls area, you can go here to search for a location.
AND - there is a $3 off 1 coupon available here! This could mean a possible money maker. Hurry, coupon expires 7/31/10!