Sunsmile*2013 via eBay continues to offer these Steampunk Flip-Up Sunglasses in Black for $1.94 with free shipping. (Three other colors are available for a few cents more.) That's the lowest total price we could find by $4, excluding other eBay vendors, although we saw them for about a buck less in October. They feature a plastic frame.

Note: Allow up to eight weeks for delivery.