Tanga offers the Duck River Textile Esy Reversible Pintucked Duvet Cover 3-Piece Set in several colors (Grey pictured) for $38.99 with free shipping. That's $2 under our March mention and the lowest price we could find now by at least $9, excluding the below mention. It's available in queen and king sizes and includes two shams and a duvet cover.

A close price: Groupon offers it in several colors (queen only) for $39.99 with free shipping.