In the Smart Source insert in the paper today (9/27/09) there is an advertisement for Palmolive Pure + Caring or Pure + Clear dish liquid. On the top is a $.75 coupon and form to fill out to be reimbursed up to $2.99 with a mail in rebate.
This is easy, free dishwashing liquid (if you are willing to do the paperwork). Make sure you follow the directions!
Also, if you are trying to purchase enough things to use a $5 off or $25 coupon at a store (i.e. Rite Aid) this could help get the amount high enough to use the coupon!