In 2006, LEGO released 3 SpongeBob SquarePants 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 $1,368, a growth of 1421%.
Most valuable 2006 SpongeBob SquarePants set
3827 Adventures in Bikini Bottom $498.99
Highest growth 2006 SpongeBob SquarePants set
3825 Krusty Krab +2124.46%
3 sets

3825 Krusty Krab

Theme SpongeBob SquarePants
Year 2006
Pieces / Minifigs 295 / 3
Availability Retired
3825 LEGO SpongeBob SquarePants Krusty Krab
Retail $19.99
Value $444.67
Growth  +2124.5%
Annual growth 10.1%

3826 Build-A-Bob

Theme SpongeBob SquarePants
Year 2006
Pieces / Minifigs 445 / 1
Availability Retired
3826 LEGO SpongeBob SquarePants Build-A-Bob
Retail $29.99
Value $424.34
Growth  +1314.9%
Annual growth 8.8%

3827 Adventures in Bikini Bottom

Theme SpongeBob SquarePants
Year 2006
Pieces / Minifigs 579 / 3
Availability Retired
3827 LEGO SpongeBob SquarePants Adventures in Bikini Bottom
Retail $39.99
Value $498.99
Growth  +1147.8%
Annual growth 9.0%