I have not tested this so it might as well be listed for parts.
All my ps1 controllers and memory cards variants : r/gamecollecting
Use Modern Wireless Controllers On PS2 And PS1 With 8BitDo's New
RGEEK 256MB Memory Card with Wireless Controller
Retro Fighters Defender Next-Gen PS1 - PS2 - PS3 - PS
Retro Fighters Defender Next-Gen PS1 - PS2 - PS3 - PS
Sony Playstation DualShock Controller - Gray (Renewed)
PlayStation 1 PS1 Console 1 Controller, 2 Wireless controllers, 2
Playstation Ps 1 Memory Card, Card Memory Playstation Ps1
PLAYSTATION1 PS1 CONSOLE 2 controlers 6 games £15.00 - PicClick UK
BITFUNX RetroScaler PS2/PS1 Wireless Controller