In 1988, LEGO released 3 Dacta Duplo sets, all of these sets have been retired. For that year, the total price of all retail sets cost $70, today those sets are valued around $793, a growth of 1034%.
Most valuable 1988 LEGO Dacta Duplo set
9221 Town Scene Mosaics $477.67
Largest 1988 LEGO Dacta Duplo set
9220 Farm Scene Mosaics 81 pieces
3 sets

9155 Circus

Theme / Subtheme Dacta / Duplo
Year 1988
Pieces / Duplo figures 60 / 6
Availability Retired
9155 LEGO Dacta Duplo Circus
Retail $29.99
Value $67.52
Growth  +125.1%
Annual growth 2.2%

9220 Farm Scene Mosaics

Theme / Subtheme Dacta / Duplo
Year 1988
Pieces 81
Availability Retired
9220 LEGO Dacta Duplo Farm Scene Mosaics
Retail $19.99
Value $248.08
Growth  +1141.0%
Annual growth 7.6%

9221 Town Scene Mosaics

Theme / Subtheme Dacta / Duplo
Year 1988
Pieces 81
Availability Retired
9221 LEGO Dacta Duplo Town Scene Mosaics
Retail $19.99
Value $477.67
Growth  +2289.5%
Annual growth 8.7%