Amazon currently has the Skylanders Superchargers Donkey Kong / Barrell Blaster Duel Pack (DK also works as a Nintendo Amiibo) on sale for $7.44. The Bowser / Clown Cruiser Duel Pack (Bowser works as an Amiibo) is also on sale for $13.44. Both packs are regularly priced $24.99 each, and used to only be available as part of the starter pack sets.

Donkey Kong set: http://www.amazon.com/Activision-...01A2KAEVW/

Bowser set: http://www.amazon.com/Skylanders-...01A2L4BXS/