What To Say: “We both know the sale is about over and you still have quite a bit of this outdoor furniture left. How much more of a break can I get if I double my initial order?”
You’re getting more, and at a larger discount, but – most important – you’ve simultaneously solved the merchant’s problem. (I’ll reduce your inventory even more, in exchange for a break.”) This way you both gain – or at least you’re presenting it that way.