UPDATE: Kmart has yanked this off their website and it now beeps at the registers. Apparently it was intended for use by one specific customer and got "leaked" to the Internet. Please do not attempt to use it.
Hurry and get this printable coupon for a $10 off $20 purchase at Kmart before it disappears! This coupon is valid through 5/22/10, so you'll be able to use it during Double Coupon Week from April 4th to the 10th.
HINT: Since it's a PDF, I'd recommend saving a copy to your hard drive so that you can print it as many times as you need to.