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 $77, a growth of 1840%.
Most valuable 2015 LEGO Ninjago Promotional set
5003085 Minifigure Pack $31.29
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 $14.23
Annual growth 5.6%

5003085 Minifigure Pack

Theme / Subtheme Ninjago / Promotional
Year 2015
Pieces / Minifigs 17 / 2
Availability Retired
5003085 LEGO Ninjago Minifigure Pack
Retail $3.99
Value $31.29
Growth  +684.2%
Annual growth 11.6%

Micro Shinto Shrine

Theme / Subtheme Ninjago / Promotional
Year 2015
Pieces 18
Availability Retired
LEGO Ninjago Micro Shinto Shrine
promotional
Value $6.95
Annual growth 7.3%

Micro Electromech Robot

Theme / Subtheme Ninjago / Promotional
Year 2015
Availability Retired
LEGO Ninjago Micro Electromech Robot
promotional
Value $17.99
Annual growth 10.3%

Micro Morro Dragon

Theme / Subtheme Ninjago / Promotional
Year 2015
Pieces 29
Availability Retired
LEGO Ninjago Micro Morro Dragon
promotional
Value $6.96
Annual growth 10.3%