In 2008, LEGO released 7 Power Functions sets across 2 subthemes, all of these sets have been retired. Subthemes for that year included Accessories and Technic. For that year, the total price of all retail sets cost $82, today those sets are valued around $293, a growth of 258%.
Most valuable 2008 LEGO Power Functions set
8293 Motor Set $100.00
Highest growth 2008 Power Functions set
8886 Extension Cable 20cm +485.62%
7 sets

8293 Motor Set

Theme / Subtheme Power Functions / Technic
Year 2008
Pieces 10
Availability Retired
8293 LEGO Power Functions Technic Motor Set
Retail $29.99
Value $100.00
Growth  +233.4%
Annual growth 10.1%

8881 Battery Box

Theme / Subtheme Power Functions / Accessories
Year 2008
Pieces 1
Availability Retired
8881 LEGO Power Functions Battery Box
Retail $6.99
Value $38.45
Growth  +450.1%
Annual growth 14.3%

8882 XL-Motor

Theme / Subtheme Power Functions / Accessories
Year 2008
Pieces 1
Availability Retired
8882 LEGO Power Functions XL-Motor
Retail $9.99
Value $44.96
Growth  +350.1%
Annual growth 25.9%

8883 M-Motor

Theme / Subtheme Power Functions / Accessories
Year 2008
Pieces 1
Availability Retired
8883 LEGO Power Functions M-Motor
Retail $7.49
Value $38.63
Growth  +415.8%
Annual growth 12.1%

8884 IR Receiver

Theme / Subtheme Power Functions / Accessories
Year 2008
Pieces 1
Availability Retired
8884 LEGO Power Functions IR Receiver
Retail $14.99
Value $24.11
Growth  +60.8%
Annual growth 3.7%

8885 IR Remote Control

Theme / Subtheme Power Functions / Accessories
Year 2008
Pieces 1
Availability Retired
8885 LEGO Power Functions IR Remote Control
Retail $9.49
Value $29.80
Growth  +214.0%
Annual growth 6.8%

8886 Extension Cable 20cm

Theme / Subtheme Power Functions / Accessories
Year 2008
Pieces 1
Availability Retired
8886 LEGO Power Functions Extension Cable 20cm
Retail $2.99
Value $17.51
Growth  +485.6%
Annual growth 13.3%