In 2015, LEGO released 5 Ninjago Promotional sets, all of these sets have been retired. For that year, the total price of all retail sets cost $4, today those sets are valued around $76, a growth of 1812%.
Most valuable 2015 LEGO Ninjago Promotional set
5003085 Minifigure Pack $29.99
Largest 2015 LEGO Ninjago Promotional set
Micro Morro Dragon 29 pieces
5 sets

5002919 Scenery and Dagger Trap

Theme / Subtheme Ninjago / Promotional
Year 2015
Pieces 26
Availability Retired
5002919 LEGO Ninjago Scenery and Dagger Trap
promotional
Value $14.53
Annual growth 6.0%

5003085 Minifigure Pack

Theme / Subtheme Ninjago / Promotional
Year 2015
Pieces / Minifigs 17 / 2
Availability Retired
5003085 LEGO Ninjago Minifigure Pack
Retail $3.99
Value $29.99
Growth  +651.6%
Annual growth 11.2%

Micro Shinto Shrine

Theme / Subtheme Ninjago / Promotional
Year 2015
Pieces 18
Availability Retired
LEGO Ninjago Micro Shinto Shrine
promotional
Value $6.92
Annual growth 7.4%

Micro Electromech Robot

Theme / Subtheme Ninjago / Promotional
Year 2015
Availability Retired
LEGO Ninjago Micro Electromech Robot
promotional
Value $17.91
Annual growth 10.4%

Micro Morro Dragon

Theme / Subtheme Ninjago / Promotional
Year 2015
Pieces 29
Availability Retired
LEGO Ninjago Micro Morro Dragon
promotional
Value $6.93
Annual growth 10.4%