My current set up. Picked one total set up cost me about $50, including the the psp off marketplace. : r/PSP
PSP-Nx-v4-REF Combo with Wireless Controller
PSP External Controller Wiring | Hackaday
Sony PSP 2000 Comfort Grip Ergonomic Handheld Controller PSP 3000 Playstation | eBay
Buy Wholesale China Mkg Player Game Controller Pro Nfc Gamepad Psp Ps1 Wired Bluetooth Mode 4 Led & Game Controller Gamepad Psp Ps1 at USD 15 | Global Sources
2.4GHZ Controller Gamepad Wireless Joystick Joypad For PSP/N64/PS1 Video Game Console For Super Console X Pro/ PC /TV Box
🔧How To Setup ANY Controller in PPSSPP Emulator PC!✔️ - Generic USB Gamepad - YouTube
PSP stereoController2 the correction tool for dual channel stereophonic signals!
So I've had my psp go for some time and had my PS3 for a VERY long time and I've been using the Dualshock 3 on my PSP GO for some time
4K Game Stick Lite Video Game Console 64GB Wireless Controller For 20000 Retro Games Kid Gift Wireless Two-grip PSP Game Console - AliExpress
Backbone's official PlayStation controller lets you play all your favorite PS titles on your phone - Yanko Design
Playstation Psp 3000 Core Pack - Walmart.com
Authentic PlayStation Portable PSP 3000 Console - Radiant Blue - 100% OEM - Walmart.com
Adding PSP Bluetooth controller support | TechPowerUp Forums
Sony PlayStation Portal Remote Player for PS5 Console | GameStop
PSP Switch Works Well Genuine Pro Controller Japan | eBay
Backbone One x PlayStation® | Mobile Gaming Controller
2.4g Wireless Gamepad Tv Box | Wireless Psp Controller Pc | Android Gamepad Pc Games - Gamepads - Aliexpress
Amazon.com: Hand Grip Controller Handle Holder for PSP 2000/3000 Black Anti-Slip Design Ergonomic Easy to Install Durable Portable Gaming Accessory Control Enhanced Protection : Video Games
2.4G Wireless Gamepad For PSP / PC / TV Box /Android Phone Game Controller Joystick For Super