Amazon offers Prime members the Skylanders SuperChargers: Vehicle Sea Shadow Character Pack
with free shipping
. (Non-members can spend $35 or more to qualify for free shipping; otherwise, shipping adds $4.98.) That's a buck under yesterday's mention and at least $6 less than you'd spend at a local retail store, outside of the mention below. It's compatible with all consoles and requires the SuperChargers Portal (included in the Skylanders SuperChargers Starter Pack) to be used in-game.
A close price: Walmart
offers it for $9.43 via in-store pickup.