Adorama via eBay offers the refurbished Canon EF 24-105mm f/4L IS USM Autofocus Lens, model no. 0344B002, for $599.99 with free shipping. That's $20 under our September mention and the lowest total price we've seen. (It's also $100 less than the best price we could find for a new unit.) It features image stabilization and three aspherical lens elements and includes a lens hood and pouch. A 1-Year Canon warranty applies.