In 2003, LEGO released 8 Explore Together sets, all of these sets have been retired. For that year, the total price of all retail sets cost $143, today those sets are valued around $615, a growth of 331%.
Most valuable 2003 LEGO Explore Together set
3700 Emergency Vehicles Set $209.51
Largest 2003 LEGO Explore Together set
3657 Fire Fighters 35 pieces
Most owned 2003 Explore Together set
3698 Friendly Police Car
8 sets

3655 Fire Action

Theme / Subtheme Explore / Together
Year 2003
Pieces / Minifigs 11 / 2
Availability Retired
3655 LEGO Together Fire Action
Retail $11.99
Value $27.07
Growth  +125.8%
Annual growth 2.1%

3656 Police Action

Theme / Subtheme Explore / Together
Year 2003
Pieces / Minifigs 32 / 4
Availability Retired
3656 LEGO Together Police Action
Retail $39.99
Value $75.74
Growth  +89.4%
Annual growth 2.8%

3657 Fire Fighters

Theme / Subtheme Explore / Together
Year 2003
Pieces / Minifigs 35 / 4
Availability Retired
3657 LEGO Together Fire Fighters
Retail $39.99
Value $123.88
Growth  +209.8%
Annual growth 4.5%

3696 Tow-Me Truck

Theme / Subtheme Explore / Together
Year 2003
Pieces / Minifigs 5 / 1
Availability Retired
3696 LEGO Together Tow-Me Truck
Retail $6.99
Value $49.23
Growth  +604.3%
Annual growth 4.2%

3697 Fearless Fire Fighter

Theme / Subtheme Explore / Together
Year 2003
Pieces / Minifigs 5 / 1
Availability Retired
3697 LEGO Together Fearless Fire Fighter
Retail $6.99
Value $29.45
Growth  +321.3%
Annual growth 7.4%

3698 Friendly Police Car

Theme / Subtheme Explore / Together
Year 2003
Pieces / Minifigs 4 / 1
Availability Retired
3698 LEGO Together Friendly Police Car
Retail $6.99
Value $26.23
Growth  +275.3%
Annual growth 8.8%

3699 Happy Constructor

Theme / Subtheme Explore / Together
Year 2003
Pieces / Minifigs 9 / 1
Availability Retired
3699 LEGO Together Happy Constructor
Retail $9.99
Value $74.29
Growth  +643.6%
Annual growth 9.1%

3700 Emergency Vehicles Set

Theme / Subtheme Explore / Together
Year 2003
Pieces / Minifigs 9 / 3
Availability Retired
3700 LEGO Together Emergency Vehicles Set
Retail $19.99
Value $209.51
Growth  +948.1%
Annual growth 10.7%