I would start with the clearance section, since they are offering an extra 25% OFF all items there. That's a discount on top of a discount.
Spend $99 or more they will ship to your house for free, or go into the store to pick it up. On some of the bigger offers (furniture, jewelry, etc) they are even offering great financing offers so you don't have to rack up that credit card bill in one swooping purchase.
Click here to view the sale at Macy's and to shop around.