So we recently found the rebate form pictured above on a box of 28lb. Arm & Hammer Ultra Last cat litter. I recognized it as a new product and researched to see if there were any rebates online for those not lucky enough to find a peelie rebate.
Well there sure is! Even better, the form found here is for a full refund (up to $8.99) or a 20 lb. box of litter!
The one we found was for $8 back on a 28 lb, so not quite "try me free" but still good.
Anyway, the rebate is good on purchases through 3/30/12, but I'd print it now just in case it randomly disappears from the net, as rebates sometimes do.