In 2005, LEGO released 3 Duplo Castle sets, all of these sets have been retired. For that year, the total price of all retail sets cost $140, today those sets are valued around $1,588, a growth of 1035%.
Most valuable 2005 LEGO Duplo Castle set
4785 Black Castle $1,244.26
Theme / Subtheme Duplo / Castle
Year 2005
Pieces / Duplo figures 64 / 2
Availability Retired
4779 LEGO Duplo Castle Defence Tower
Retail $24.99
Value $211.29
Growth  +745.5%
Annual growth 9.0%
Theme / Subtheme Duplo / Castle
Year 2005
Pieces / Duplo figures 8 / 1
Availability Retired
4784 LEGO Duplo Castle Black Dragon
Retail $14.99
Value $132.46
Growth  +783.7%
Annual growth 7.1%
Theme / Subtheme Duplo / Castle
Year 2005
Pieces / Duplo figures 380 / 6
Availability Retired
4785 LEGO Duplo Black Castle
Retail $99.99
Value $1,244.26
Growth  +1144.4%
Annual growth 9.0%