Staples has 20% Off Any One Item for In-Store Purchase by using this printable coupon. It is valid through 10/29.
Note that each coupon has its own unique code so these are one-time use coupons. You can refresh the page and generate as many of these one-time use coupons as you like.
Some exclusions do apply, such as desktop or laptop computers, LCD/LED displays, and others as detailed in the fine print.