In 2004, LEGO released 3 Duplo Castle sets, all of these sets have been retired. For that year, the total price of all retail sets cost $90, today those sets are valued around $986, a growth of 1096%.
Most valuable 2004 LEGO Duplo Castle set
4777 Knights' Castle $495.58
Highest growth 2004 Duplo Castle set
4776 Dragon Tower +1397.57%
Theme / Subtheme Duplo / Castle
Year 2004
Pieces / Duplo figures 19 / 2
Availability Retired
4775 LEGO Duplo Castle Knight and Squire
Retail $9.99
Value $40.95
Growth  309.9%
Annual growth 7.5%
Theme / Subtheme Duplo / Castle
Year 2004
Pieces / Duplo figures 63 / 2
Availability Retired
4776 LEGO Duplo Castle Dragon Tower
Retail $29.99
Value $449.12
Growth  1397.6%
Annual growth 10.1%
Theme / Subtheme Duplo / Castle
Year 2004
Pieces / Duplo figures 164 / 4
Availability Retired
4777 LEGO Duplo Knights' Castle
Retail $49.99
Value $495.58
Growth  891.4%
Annual growth 7.7%