In 2013, LEGO released 2 Power Functions Accessories sets, all of these sets have been retired. For that year, the total price of all retail sets cost $39, today those sets are valued around $132, a growth of 240%.
Most valuable 2013 LEGO Power Functions Accessories set
88004 Servo Motor $99.82
Largest 2013 LEGO Power Functions Accessories set
88003 L-Motor 1 pieces
2 sets

88003 L-Motor

Theme / Subtheme Power Functions / Accessories
Year 2013
Pieces 1
Availability Retired
88003 LEGO Power Functions L-Motor
Retail $13.99
Value $32.63
Growth  +133.2%
Annual growth 5.3%

88004 Servo Motor

Theme / Subtheme Power Functions / Accessories
Year 2013
Pieces 1
Availability Retired
88004 LEGO Power Functions Servo Motor
Retail $24.99
Value $99.82
Growth  +299.4%
Annual growth 11.2%