Postmonkey

This is a new tower that is exclusive to Bloons TD Battles 2. This tower throws letters at bloons. The letters fly around randomly, and they will pop 3 bloons per letter. Cannot pop lead or detect camos without upgrades. (Speed = 0-0 Monkey Buccaneer) Cost: $450

Path I

 * Sharper Creases: Special creasing technique increases the popping power of each letter. (Letters now pop 6 bloons each.) Cost: $300
 * Shipping Boxes: Heave-ho! These heavy boxes squish lead bloons and seriously put the hurt on ceramics! (Occasionally throws a box that can pop lead bloons and deals 3 damage to ceramic bloons. M.O.A.B.-Class Bloons cannot be crushed by the boxes.) Cost: $1250
 * Homing Pigeons: These smart little birds lock onto bloons and pop them before returning to their master. (Occasionally sends out up to two homing pigeons. The pigeons fly out toward bloons and pop them. Pigeons will pop up to 50 bloons before returning home. Oh, and they will attack M.O.A.B.-Class Bloons. When a pigeon attacks a M.O.A.B.-Class Bloon, they will peck at them until they deal 10 damage per pigeon.) Cost: $2700
 * Pigeon Barn Manager: The manager of the Pigeon Barn has came to the battlefield! Now, let loose a mighty wave of 5 pigeons each! (Max number of pigeons increased to 5. Pigeon release rate increased to that of the bombs from a 2-3 Monkey Buccaneer.) Cost: $5100

Path II

 * More Letters: Increased business today adds in more letters for your postmonkey to throw! (Speed = X-3 Monkey Engineer) Cost: $500
 * Motto of the Postmonkeys: Not even camo bloons can stop the Monkey Postal Service! (Can now detect camo bloons.) Cost: $400
 * Rush Delivery: Gotta be fast with this one! (Letters and boxes [if you bought Shipping Boxes, of course. XD] are now produced at double the speed.) Cost: $2000
 * Return to Sender: Return to Sender Ability: Any bloon waves your opponent queues for the next 20 seconds are redirected to him. Waves containing M.O.A.B.-Class Bloons cannot be redirected. Cooldown: 60 seconds. Cost: $5100

Trivia

 * Return to Sender is a reference to Elvis Presley's "Return to Sender".