Amazon offers Prime members the Tovolo Perfect Cube Ice Tray 2-Pack in Stratus Blue for $7.99 with free shipping. (Target charges the same with free shipping.) That's the lowest price we could find by $6. Each tray makes 15 cubes and measures 7" x 4.5" x 1.5".

Update: The price has increased at Amazon; however, Target still offers it for $7.99 plus in-store pickup.