Check out the clearance section in your local Staples store and save an extra 25% off when you shop before July 19th. No coupon is needed for this deal.
This offer does not apply to online orders but since they are closing some stores and changing the items they stock, you may be able to pick up some real bargains. I got a new router recently at 60% off because the box had been ripped and noticed some other great deals if I had needed those items.
Click here to find a Staples store (do check before making the trip as my local one recently closed without much notice).
If you want to buy more than just clearance while you are there, check out their weekly flyer here.