Target takes up to 40% off a selection of men's, women's, and kids' Halloween costumes, with deals starting from $4.20. Shipping starts at $4.99. (Choose Seasonal shipping to guarantee delivery by October 30.) A couple of best bets, each with $4.99 for shipping: Of note, Target also takes up to 40% off select costumes in-store for Cartwheel members. (Not a member? Click here to sign up.)