Canon offers its factory-refurbished Canon Speedlite 600EX-RT Professional Camera Flash, model no. 5296B002, for $439.99 with free shipping. That's $114 under our mention of a new unit from last fall and the lowest total price we've seen. (It's currently $59 less than the best we could find for a new unit.) It features an LCD panel, radio-controlled wireless transmission up to 98.4 feet, and more. A 90-day Canon warranty applies.