Tanga offers the Homecrest 1800 Egyptian Microfiber Comfort Sheet Set in 10 colors (Burgundy pictured) for $18.99 with free shipping. That's tied with our mention from three weeks ago and the lowest total price we could find for such a bedding set by $9, outside of the mention below. Each set includes a fitted sheet, flat sheet, and at least one pillowcase. It's available in twin, full, queen, and king sizes, although not in all size/color combinations.
A close price: Jlawre19 via eBay charges a buck more with free shipping.