Amazon.com: Rock Pi 4 Plus Rockchip RK3399(OP1) Single Board Computer LPDDR4 4GB with WiFi 5 and Bluetooth 5.0 Support Twister OS (4GB RAM+64GB eMMC) : Electronics
Canakit Raspberry Pi 4 4gb Starter Kit | Canakit Raspberry Pi 4 8gb Starter Kit - 4 - Aliexpress
Amazon.com: Orange Pi 5 16GB Rockchip RK3588S 8 Core 64 Bit Single Board Computer, 2.4GHz Frequency Open Source Development Board Mini PC Desktop Run Orange Pi OS,Android12,Debian11 (Pi 5 16GB+5V4A TypeC Supply) :
Radxa ROCK 5A SBC - A Raspberry Pi 4 lookalike with up to 16GB RAM, Rockchip RK3588S SoC - CNX Software
Amazon.com: Raspberry Pi 4 Model B 2019 Quad Core 64 Bit WiFi Bluetooth (1GB) : Electronics
Raspberry Pi 4 B: How Much RAM Do You Really Need? | Tom's Hardware
Raspberry Pi 4 Model B Starter Kit 2GB/4GB/8GB RAM Comes with 16GB TFT Card Heat Sink and Power Supply _ - AliExpress Mobile