Walmart offers the Whitmor Over-the-Door Closet Rod for $9.50. To drop the price to $8.54, opt for in-store pickup. (Amazon has it for pennies more.) That's at least $6 less than you'd pay at another local retail store. It features iron construction with a silver epoxy finish.
Update: The item at Walmart is not available; however, Amazon has it for $8.37 with free shipping for Prime members.