With orders of $25 or more, Amazon offers Prime members the Mega Bloks Halo Micro-Fleet Mantis Invasion
, model no. DBB12, for $6.99
with free shipping
. (Non-members can spend $35 or more to qualify for free shipping.) That's the lowest total price we could find by $6. It features a buildable Mantis and Covenant shade turret, UNSC soldier, and collectible Spartan helmet.
Note: This item is part of Amazon's "Add-on Program" and can only be purchased with an order of $25 or more.