In 2018, LEGO released 3 Harry Potter Promotional sets, all of these sets have been retired. For that year, the total price of all retail sets cost $8, today those sets are valued around $127, a growth of 1489%.
Most valuable 2018 LEGO Harry Potter Promotional set
40289 Diagon Alley $73.07
Highest growth 2018 Harry Potter Promotional set
5005254 Harry Potter Minifigure Collection +327.91%
Theme / Subtheme Harry Potter / Promotional
Year 2018
Pieces / Minifigs 374 / 1
Availability Retired
40289 LEGO Harry Potter Diagon Alley
promotional
Value $73.07
Annual growth 13.3%
Theme / Subtheme Harry Potter / Promotional
Year 2018
Pieces / Minifigs 25 / 4
Availability Retired
5005254 LEGO Harry Potter Minifigure Collection
Retail $7.99
Value $34.19
Growth  +327.9%
Annual growth 12.3%
Theme / Subtheme Harry Potter / Promotional
Year 2018
Pieces 35
Availability Retired
6385434 LEGO Harry Potter Golden Snitch
promotional
Value $19.72
Annual growth 9.3%