In 2008, LEGO released 5 Education Duplo sets, all of these sets have been retired. For that year, the total price of all retail sets cost $610, today those sets are valued around $1,379, a growth of 126%.
Most valuable 2008 LEGO Education Duplo set
9656 Early Simple Machines Set $336.08
Highest growth 2008 Education Duplo set
9531 Numbers and Mosaics Set +396.02%
5 sets

9076 Tubes Experiment Set

Theme / Subtheme Education / Duplo
Year 2008
Pieces / Duplo figures 147 / 4
Availability Retired
9076 LEGO Education Duplo Tubes Experiment Set
Retail $89.99
Value $211.95
Growth  +135.5%
Annual growth 5.0%

9206 Tech Machines Set

Theme / Subtheme Education / Duplo
Year 2008
Pieces / Duplo figures 111 / 5
Availability Retired
9206 LEGO Education Duplo Tech Machines Set
Retail $209.95
Value $305.39
Growth  +45.5%
Annual growth 5.1%

9215 Dolls Family Set

Theme / Subtheme Education / Duplo
Year 2008
Pieces / Duplo figures 87 / 7
Availability Retired
9215 LEGO Education Duplo Dolls Family Set
Retail $105.00
Value $326.90
Growth  +211.3%
Annual growth 5.4%

9531 Numbers and Mosaics Set

Theme / Subtheme Education / Duplo
Year 2008
Pieces 352
Availability Retired
9531 LEGO Education Duplo Numbers and Mosaics Set
Retail $39.99
Value $198.36
Growth  +396.0%
Annual growth 9.9%

9656 Early Simple Machines Set

Theme / Subtheme Education / Duplo
Year 2008
Pieces 102
Availability Retired
9656 LEGO Education Duplo Early Simple Machines Set
Retail $164.95
Value $336.08
Growth  +103.7%
Annual growth 5.1%