Discount

Buff icon for Monkey Business in BTD6, representing discount

Discount is a game mechanic in the Bloons TD series, which by definition is the reduction in the cost of towers and/or upgrades. Certain discounts can be the full amount. Most sources of discounts require a tower to be within range to gain the benefit.

The new cost after discount depends on the game's rounding system.

History

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Starting in Bloons Tower Defense 2, the Easy difficulty reduces the costs of towers and upgrades by a set percentage as compared to the base amount. This cost reduction is applied before all other discounts. Starting from Bloons TD 4, Medium has a 100% price, which strangely enough is 102% in Bloons Tower Defense 2 and Bloons TD 3.

Discount buffs were introduced in Bloons TD 5 with the Monkey Village, which reduces the cost of towers and upgrades purchased in its range by 10%. BTD5 also introduced Specialty Buildings which discounts a specific type of tower by 5%, and increases the cost of a different tower by 5%.

Bloons TD 6

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Bloons TD 6 introduced many more discount sources. Some of these apply a percentage change in cost, while others apply a flat decrease. Many discount sources only apply to certain towers or upgrades. Placement and upgrade costs, aside from purchasing Hero levels (which rounds to the nearest 1), are always rounded to a multiple of 5.

Discount percentage buffs

In BTD6, buffs to discount percentage stack additively with each other. For example, Monkey Business and discount tiles on One Two Tree both increase discount by 10%. Therefore when a purchase is affected by both, its costs are reduced by 20%.

If a discount percentage is 100% or higher on a tower or upgrade, it may be obtained for free; Primary Mentoring for Tier 1 upgrades of Primary Monkeys and Monkey City's free Dart Monkeys are examples of this. Unless otherwise stated, multiple towers granting identical discount percentage buffs do not stack.

Paragon upgrades and Geraldo's Shop items cannot be discounted by these buffs. Purchasing Hero levels cannot be discounted by these buffs, except for Scholarships. In Rogue Legends, party members cannot have their placement cost discounted.

Sources of discount percentage buffs in BTD6

Source	Percentage	Affected towers and upgrades	Notes
Towers
Monkey Business	10% (or 12% with Insider Trades)	All tower placements, upgrades up to tier 3
Monkey Commerce	5%	All tower placements, upgrades up to tier 3	Stacks additively up to 3 times on the same tower.
Primary Mentoring	100%	Tier 1 Primary upgrades
Primary Expertise	100%	Tier 1 and 2 Primary upgrades
Monkey City	100%	Placement of the next Dart Monkey.	Can stack additively, with no limit to the number of free Dart Monkeys. Prioritizes over Bonus Monkey!.
Sun Temple	10%	All tower placements and upgrades	Requires $15,001 – $20,000 in Support sacrifices.
	20%	All tower placements and upgrades	Requires $40,001 or more in Support sacrifices.
True Sun God	10%	All tower placements and upgrades	Requires $15,001 – $20,000 in Support sacrifices.
	20%	All tower placements and upgrades	Requires $40,001 or more in Support sacrifices.
Rosalia	10%	Monkey Ace and Heli Pilot placements and upgrades	Requires level 6+.
	30%	The Anti-Bloon upgrade	Requires level 20.
Silas	25%	Tier 5 upgrades for Ice Monkey	Requires level 13+.
Maps
One Two Tree	10%	All tower placements and upgrades	On tiles labelled with
Polyphemus	15%	All tower placements and upgrades	Inside the eye
Monkey Knowledge
Come On Everybody!	5%	All Primary upgrades	Only applied when all Primary towers are tier 3 or 4.
Bonus Glue Gunner	100%	Placement of the first Glue Gunner	Cannot be used if the free Dart Monkey provided by Bonus Monkey! was placed.
Bonus Monkey!	100%	Placement of the first Dart Monkey	Cannot be used if the free Glue Gunner provided by Bonus Glue Gunner was placed.
Military Conscription	33%	Placement of the first Military tower
Advanced Logistics	5%	Military tower placements
Flat Pack Buildings	2%	Banana Farm and Monkey Village placements
Scholarships	10%	Hero levels	Only discount in this table to affect Hero levels.
Hero Favors	10%	Hero placements

Discount buffs from different Sun Temples can stack if they are different amounts. For example, towers receive a 30% discount percentage if they are in range of a Sun Temple with $2,000 in Support sacrifices, and another Sun Temple with $50,000 in Support sacrifices.

Price percentage adjustments

Some discounts apply by changing the base cost of towers and upgrades, rather than applying a buff. Unlike buffs, these stack multiplicatively with discount percentage buffs and with each other. They can affect the prices of Paragon upgrades, Geraldo's Shop items, and Hero levels.

Sources of price percentage adjustments

Source	Percentage	Notes
Easy	85%	Relative to Medium.
Hard	108%	Relative to Medium.
Impoppable	120%	Relative to Medium.
Aeronautic Subsidy	90%	Only applies to tier 5 Monkey Ace upgrades.

In Custom Challenges, the Impoppable property overrides the price adjustments by the game difficulty.

Flat price reductions

Some Monkey Knowledge upgrades reduce the cost of specific towers or upgrades by a flat amount. These price reductions apply after adjustments from game difficulty, but before discount percentage buffs.

Sources of flat price reductions

Source	Amount	Affected towers and upgrades
Cheap 'Rangs	$50	Boomerang Monkey placement
Budget Clusters	$100	Cluster Bombs upgrade
Cheaper Solution	$1,000	Bloon Liquefier upgrade
Cheaper Maiming	$1,000	Maim MOAB upgrade
Budget Battery	$600	Artillery Battery upgrade
Magic Tricks	$25	Guided Magic and Intense Magic upgrade
Cheaper Doubles	$100	Double Shot upgrade
Warm Oak	$100	Heart of Oak upgrade
First Last Line of Defense	$150	First Spike Factory placement
Farm Subsidy	$100	First Banana Farm placement
Hi-Value Mines	$1,500	Spiked Mines upgrade

Bloons TD Battles 2

This section is incomplete. You can help out by expanding it. The editor who added this notice elaborates: Add a similar structure to the BTD6 one but add BTDB2 stuff

Bloons TD Battles 2 has a similar variety of discount sources as BTD6, but with certain new sources. Rules for determining discounts is the same as in BTD6; rounding placement and upgrade costs to a multiple of 5, with exception of Heroes which round to the nearest 1, and discount sources may apply flat or percentage buffs that may affect certain types of tower.