Pre-installed Raspberry Pi Phone System or SBC for only $99
Amazon.com: Rock Pi 4 Plus Model B Rockchip RK3399 SBC Single Board Computer eMMC Flash pre-Loaded with Twister OS Armbian Raspberry pi 4 (64G eMMc, with Heatsink) : Electronics
8-Core, Qualcomm-Powered SBC Set to Take on Raspberry Pi, Features Embedded RP2040 | Tom's Hardware