Spotted a PS4 Devkit in a local used games store : r/gamecollecting
PS4 Pro (NEO) DevKit / TestKit OFW 3.70, Pictures and Screenshots | PSXHAX - PSXHACKS
Playstation 4 Development System DevKit - YouTube
PlayStation Dev Kits Through The Years (PS1, PS2, PS3, PS4 and PS5) - Grown Gaming
PlayStation 5 devkit and final next-gen console designs are revolutionary in comparison to previous efforts leaving high expectations for the PS6 - NotebookCheck.net News
PS4 Pro (NEO) DevKit / TestKit OFW 3.70, Pictures and Screenshots | PSXHAX - PSXHACKS