Tower Cost Specialties

When starting a new game in Bloons TD 4 Expansion, on the "Set Game Mode" screen after selecting a track, the player can select a Specialty. There are 7 Specialties to choose from and each one of them lowers the cost of certain things by 20%, and raises the cost of everything else by 10%. To select a specialty, click its check box. If the player usually only uses a few types of tower, it could be a great money saving technique.

Here is a list of all the Specialties, as well as what each of them affects:

None
All towers and upgrades cost the normal amount.

Classic
Pass Track 1, The Beach, on Easy or harder to unlock.

Dart Monkeys, Boomerang Throwers, Tack Towers, Road Spikes and their upgrades cost 20% less. Everything else costs 10% more.

Support
Pass Track 2, Sewer, on Medium or harder to unlock.

Monkey Beacons, Banana Farms, and their upgrades cost 20% less. Everything else costs 10% more.

Munitions
Pass Track 3, Monkey Temple, on Medium Difficulty or harder to unlock.

Bomb Towers, Mortar Towers, Pineapples and their upgrades cost 20% less. Everything else costs 10% more.

Vehicles
Pass Track 1, The Beach, on Hard to unlock.

Monkey Aces, Monkey Buccaneers, and their upgrades cost 20% less. Everything else costs 10% more.

Slow Down
Pass Track 2, Sewer, on Hard to unlock. (* This is what it says in game, but it is supposed to be Track 2)

Ice Towers, Glue Gunners, Monkey Glue and their upgrades cost 20% less. Everything else costs 10% more.

Supernatural
Pass Track 4, Triangle of Insanity, on Medium or harder to unlock.

Super Monkeys, Monkey Apprentices and their upgrades cost 20% less. Everything else costs 10% more.

New Towers (new)
Pass Track 3, Monkey Temple, on Hard to unlock.

Dartling Guns, Spike Factories and their upgrades cost 20% less. Everything else costs 10% more.

Trivia

 * The Vehicles Specialty suffers a bug, when the player uses it, it does reduce the cost of the Monkey Buccaneer and the Monkey Ace, but it surprisingly raises the cost of their upgrades.
 * This likely inspired Specialty Buildings in BTD5.