In 2006, LEGO released 4 Duplo Building Sets sets, all of these sets have been retired. For that year, the total price of all retail sets cost $58, today those sets are valued around $380.
Most valuable 2006 LEGO Duplo Building Sets set
3191 Anniversary Bucket $325.68
Most owned 2006 Duplo Building Sets set
2598 Large Red Building Plate
Theme / Subtheme Duplo / Building Sets
Year 2006
Pieces 1
Availability Retired
2598 LEGO Duplo Large Red Building Plate
Retail $14.99
Value $15.69
Growth  +4.7%
Annual growth 2.5%
Theme / Subtheme Duplo / Building Sets
Year 2006
Pieces 103
Availability Retired
3191 LEGO Duplo Anniversary Bucket
Retail $19.99
Value $325.68
Growth  +1529.2%
Annual growth 13.5%
Theme / Subtheme Duplo / Building Sets
Year 2006
Pieces / Duplo figures 75 / 1
Availability Retired
4085-3 LEGO Duplo Bucket
Retail $9.99
Value $38.43
Growth  +284.7%
Annual growth 6.6%
Theme / Subtheme Duplo / Building Sets
Year 2006
Pieces / Duplo figures 48 / 2
Availability Retired
7337 LEGO Duplo Foundation Set Green Bucket
Retail $12.99