Ashopone via eBay offers this Men's Boonie Hat in Army Green for $3.02 with free shipping. (It comes in four other colors for a few cents more.) That's tied with our mention from two weeks ago and the lowest total price we could find by $2, excluding other eBay sellers. It's available in one size fits all.
Note: This item ships from mainland China and may take three to eight weeks for delivery.