As a possible mistake,
Staples cuts $15 off orders of $15 or more via coupon code "25172".
That's the best dollar-off discount we've seen on smaller purchases from Staples. (We saw a printable $5 off $25 in October.) Shipping starts at $9.95, so it's best to choose site-to-store pickup
with smaller orders. (Otherwise, get free shipping with orders of $45 or more.) Sales tax is added where applicable.
Update: Note that coupon "99279" yields a discount of $10 off orders of $10.01 or more.