In 2009, LEGO released 3 Mindstorms sets across 2 subthemes, all of these sets have been retired. Subthemes for that year included NXT and NXT 2. For that year, the total price of all retail sets cost $490, today those sets are valued around $651, a growth of 33%.
Most valuable 2009 LEGO Mindstorms set
8547 Mindstorms NXT 2.0 $432.63
3 sets

8547 Mindstorms NXT 2.0

Theme / Subtheme Mindstorms / NXT 2
Year 2009
Pieces 619
Availability Retired
8547 LEGO Mindstorms NXT 2.0
Retail $279.99
Value $432.63
Growth  +54.5%
Annual growth 2.4%

9749 NXT Temperature Sensor

Theme / Subtheme Mindstorms / NXT
Year 2009
Pieces 1
Availability Retired
9749 LEGO Mindstorms NXT Temperature Sensor
Retail $39.95
Value $42.99
Growth  +7.6%

10287 Intelligent NXT Black Brick

Theme / Subtheme Mindstorms / NXT
Year 2009
Pieces 1
Availability Retired
10287 LEGO Mindstorms Intelligent NXT Black Brick
Retail $169.99
Value $175.65
Growth  +3.3%
Annual growth 6.7%