BikePakUSA via eBay offers the Ibera Adjustable Bicycle Water Bottle Cage, model no. IB-BC4, for $6 with free shipping. (Ibera via Newegg has it for the same price with free shipping.) That's tied with our mention from a week ago and the lowest total price we could find by $2. It features an adjustable diameter that allows a range of bottles to be carried securely.