Small 4Pin/6Pin to 5V ARGB 3Pin Fan Controller Adapter Cable for Coolmoon 5V Three pin to 4pin/6Pin Controller Adapter Cable|Computer Cables & Connectors| - AliExpress
Amazon.com: Airgoo Adapter Cable for 5V 3-pin ASUS Aura SYNC, MSI Mystic Light Sync, Gigabyte RGB Fusion, Connect to Any 3-Pin SM Connector (+5V,Data,GND) ARGB Lightings, Compatible with Airgoo ARGB LED Strips :
$4.49 - RGB LED Strip to 4 Pin Adapter - Tinkersphere
4Pin PWM to 3Pin Standard Fan Adapter Cable (4 Pack)