Amazon offers the LEGO Tower Bridge, model no. 10214, for $178.55 with free shipping. (Walmart charges the same with free Site-to-Store pickup; shipping would add 97 cents.) That's the lowest total price we could find by $54. This 4,287-piece model of the Tower Bridge in London includes a black London taxi, a traditional red double-decker bus, a yellow truck, and a green automobile.

Walmart also offers the LEGO Pet Shop, model no. 10218, for $111.59 plus 97 cents for shipping. (Free Site-to-Store is also available.) That's another price low by $17. Sales tax is added where applicable.