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9747 LEGO Mindstorms Robotics Invention System thumbnail image

9747 LEGO Mindstorms Robotics Invention System
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9747 LEGO Mindstorms Robotics Invention System
  • Robotics Invention System thumbnail
  • Robotics Invention System thumbnail
  • Robotics Invention System thumbnail
  • Robotics Invention System thumbnail
  • Robotics Invention System thumbnail

Set Value (New/Sealed)

This chart represents the current new/sealed value of the set Robotics Invention System since November 2019. Medium accuracy
LEGO 9747 Robotics Invention System was a 726 piece Mindstorms set released in 1999. It features over LEGO pieces, including sensors, motors, gears, and the RCX microcomputer, which processes inputs and activates motors. Includes step-by-step instructions and programming software.

The current value for a new, factory sealed Robotics Invention System is estimated to be around $231. On the open market, a used set will sell in the range of $70 and $99, depending on its condition.
All regions

For Sale (New/Sealed)

 (US) MINDSTORMS: Robotics Invention System 1.5 (9747)
BrickEconomy Choice
$175.00
(US) NEW Lego Mindstorms RCX 9747 Robotics Invention System, Version 1.5 Super RARE $499.99
+116.1%
All regions

For Sale (Used)

 (US) Used - Mindstorms RCX 9747 Robotics Invention System Version 1.5 As Pictured
$69.95
--15.2%
(US) Used - Mindstorms RCX 9747 Robotics Invention System Version 1.5 As Pictured
$75.00
--9.1%
(US) Used - MINDSTORMS: Robotics Invention System 1.5 (9747) 99% Complete
$80.00
--3.1%
(US) Used - MINDSTORMS: Robotics Invention System 1.5 (9747)
$90.00
(US) Used - Mindstorms Robotics Invention System 1.5 Set 9747 Complete 1998 90s 717 pcs
$98.00
(US) Used - Vintage Lego 9747 Mindstorms Robotics Invention System Version 1.5 Complete
$99.99

Sets in Mindstorms / 1

9735 Robotics Discovery Set

Theme / Subtheme Mindstorms / 1
Year 1999
Pieces 390
Availability Retired
9735 LEGO Mindstorms Robotics Discovery Set
Retail $149.99
Value $228.19
Growth  +52.1%
Annual growth 2.6%

3803 Robotics Invention System Upgrade Kit

Theme / Subtheme Mindstorms / 1
Year 1999
Pieces 70
Availability Retired
3803 LEGO Mindstorms Robotics Invention System Upgrade Kit
Retail $24.99
Value $45.55
Growth  +82.3%
Annual growth 2.3%

9757 Touch Sensor

Theme / Subtheme Mindstorms / 1
Year 1999
Pieces 2
Availability Retired
9757 LEGO Mindstorms Touch Sensor
Retail $10.99
Value $14.99
Growth  +36.4%
Annual growth 1.2%

9709 RCX Programmable LEGO Brick

Theme / Subtheme Mindstorms / 1
Year 1999
Pieces 1
Availability Retired
9709 Mindstorms RCX Programmable LEGO Brick
Retail $109.99
Value $119.08
Growth  +8.3%

9738 RCX Remote Control Unit

Theme / Subtheme Mindstorms / 1
Year 1999
Pieces 1
Availability Retired
9738 LEGO Mindstorms RCX Remote Control Unit
Retail $19.75
Value $30.51
Growth  +54.5%
Annual growth 1.7%

9755 Temperature Sensor

Theme / Subtheme Mindstorms / 1
Year 1999
Pieces 1
Availability Retired
9755 LEGO Mindstorms Temperature Sensor
Retail $23.99
Value $26.53
Growth  +10.6%

9756 Rotation Sensor

Theme / Subtheme Mindstorms / 1
Year 1999
Pieces 1
Availability Retired
9756 LEGO Mindstorms Rotation Sensor
Retail $14.99
Value $15.92
Growth  +6.2%

9758 Light Sensor

Theme / Subtheme Mindstorms / 1
Year 1999
Pieces 1
Availability Retired
9758 LEGO Mindstorms Light Sensor
Retail $19.75
Value $19.99
Growth  +1.2%
Annual growth 2.1%

My Collection

Robotics Invention System Reviews

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About Mindstorms 1

This was the first generation of the LEGO Mindstorms platform also known as the original Robotics Invention System.

1 consists of 20 sets that ran from 1998 to 2004. As of today, 3800 Ultimate Builders Set is the most valuable 1 set with an estimated new/factory sealed value of $694.
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