LEGO Technic: Control+ Liebherr R 9800 Excavator Set (42100) for Sale in Federal Way, WA - OfferUp
LEGO® Technic review: 42100 Liebherr R 9800 | New Elementary: LEGO® parts, sets and techniques
Amazon.com: LIGHTAILING Light Set for (Technic Liebherr R 9800 Excavator) Building Blocks Model - Led Light kit Compatible with Lego 42100(NOT Included The Model) : Toys & Games
Review on set 42100: is it worth $450 (In comments) : r/lego
Design Secrets of my 42100 : TRACKED CARRIER alternate model - YouTube