With orders of $25 or more, Amazon offers Prime members the Meguiar's 24-oz. Hot Rims Wheel Cleaner, model no. G9524, for $1.99 with free shipping. (Non-members can spend $49 to bag free shipping.) That's the lowest total price we could find by $8. It works on rims and tires and is compatible with all factory-coated wheels.
Note that this item is part of Amazon's "Add-on program" and can only be purchased with an order of $25.