There is a $5 savings offer from duncan hines, vlasic, armour, log cabin, mrs butterworths and Open Pit. Buy 5 items and get $5 in Savings. You can find the rebate form here.
It looks like you purchase the 5 items and mail in the form. They then send you $5 in coupons. Items must be purchased before 12/7/09 and the form must be postmarked by 1/7/10. Coupons must be redeemed by 4/12/10.
They did a similar offer last year but it was for a $5 rebate. If you watch sales, you can usually find these items at a great price.