SHADOWGUN, one of the best first-person shooter games available for the Amazon Fire TV, has just gone on sale for $1.99. This matches the lowest price this game has ever been on the Fire TV. It features an advanced enemy A.I. that flanks, seeks cover, and works as a team to take you down. It has a 4 star rating from 60 reviews. SHADOWGUN is compatible with both the 1st and 2nd-gen Fire TV, and requires a game controller to play.