UKSolarseller via eBay offers Windshield Easy Cleaner for $2.73 with free shipping. (Babastoreong via eBay has it for a few cents more.) That's tied with our mention from a week ago and the lowest total price we could find by a buck. It features an ergonomic handle and microfiber bonnet.
Note: It ships from mainland China and may take three to eight weeks to arrive.