Staples offers the Finish Powerball Dishwasher Tablets 20-Count Box for $2.99. Free shipping is available for Staples Rewards members. (Not a member? Click here to sign up for free.) You can also opt for in-store pickup to avoid the $9.95 shipping fee. Either way, that's $1 under what you could expect to pay at a local Walmart. Deal ends December 7.