13 Deals offers 2 Doctor Who Tardis Gelatin/Cake Molds for $11.98. (Select two to see this price.) Coupon code "DOCTORWHO29" cuts it to $8.51. With free shipping, that's tied with last week's mention and the lowest total price we could find by $9. These silicon molds measure 5.75" x 3.25" x 1.5".
Also available is a single mold for $4.96 (after coupon) with free shipping.