In 2018, LEGO released 3 Promotional Minifigure sets, all of these sets have been retired. For that year, the total price of all retail sets cost $7, today those sets are valued around $30, a growth of 329%.
Most valuable 2018 LEGO Promotional Minifigure set
5005233 Hamleys Royal Guard $11.13
Largest 2018 LEGO Promotional Minifigure set
5005251 Penguin Winter Hut 6 pieces
Theme / Subtheme Promotional / Minifigure
Year 2018
Pieces / Minifigs 5 / 1
Availability Retired
5005233 LEGO Hamleys Royal Guard
Retail $6.99
Value $11.13
Growth  +59.2%
Annual growth 6.0%
Theme / Subtheme Promotional / Minifigure
Year 2018
Pieces / Minifigs 5 / 1
Availability Retired
5005250 LEGO Party Banana Juice Bar
promotional
Value $9.33
Annual growth 20.0%
Theme / Subtheme Promotional / Minifigure
Year 2018
Pieces / Minifigs 6 / 1
Availability Retired
5005251 LEGO Penguin Winter Hut
promotional
Value $9.50
Annual growth 19.3%