With orders of $25 or more, Amazon offers the Invisible Glass 19-oz. Premium Glass Cleaner
. Plus, Prime members receive free shipping
. (Non-members can spend $49 or more to qualify for free shipping.) That's the lowest price we could find by $8, outside of the mention below.
A close price: Kmart has it for $3.50
This item is part of Amazon's "Add-on Program"; it can only be purchased with an order of $25 or more.