eBay
Rare and hard to find Canon EF 20-88mm F 2.8-4 L USM Ultrasonic Zoom lens with Canon dedicated leather case with front and rear cap.  This used lens is in beautiful condition, focuses accurately, diaphragm is perfect and the glass has no scratches, fungus or haze, the optical pathway is pristine.  The auto focus is smooth and fast, this lens has been taken care of.  The lettering on the lens body has a couple rub spots that are insignificant. This is a fantastic lens, it does everything from macro to telephoto with incredible sharpness and color rendition.  This is the lens that will bring out the Ansel Adams in you!