Amazon.com: Waveshare Accessory Compatible with Raspberry Pi 4 Model B 4GB RAM with Powerful Processor Faster Networking Support Dual 4K Output and Different Choice of RAM Comes with a Copper Heat Sink :
A closer look at Raspberry Pi 4 8GB RAM - NotEnoughTech
Raspberry Pi 4 Model B 2GB 4GB 8GB RAM – Sunhokey Electronics Co., Ltd
LABISTS Raspberry Pi 4 8GB RAM Starter Kit, with 128GB Micro SD Card (8GB RAM) - Walmart.com
Amazon.com: Vemico Raspberry Pi 4 Model B 4GB Set RAM 4GB Base Starter Kit with SD Card, Heatsinks, HDMI Cable, Power Supply, Black Case, Reading Card Device, Screwdriver : Everything Else
Raspberry Pi 4 Model B with 4GB RAM
Raspberry Pi4 Model RAM 4Giga | YoupiLab Components