Tanga offers the Double-Stack Bento Box with snaps or handle for $9.99 with free shipping. (Icydeals via Amazon has it with snaps or a handle for the same price.) That's tied with our February mention as the lowest total price we've seen for a single unit. (It's also a current price low by $5.) Each stack comes with a bottom tray with cover, fork, spoon, utensil clasp lid, and easy-snap lid.
Note: It's not specified what color you'll receive.