Ltp Group via eBay offers the HP Business 16" Laptop Carry Case in Black for $19.99 with free shipping. That's the lowest price we could find by $21. It features an adjustable shoulder strap and holds laptops up to 15.6".
refurbforless via eBay offers the Toshiba Ultrabook 13" Envelope Sleeve in Black for $12.99 with free shipping. That's the lowest price we could find by a buck; many stores charge beyond $20. It features a magnetic closure and microfiber interior.