Some of the Vectrex things I have lying arond:
Autofire dongle:
VecRAM 64k: 
Multicard 72: 
PSX2 Adapter:
3d Shutter glasses:
VecVoice: 
Lightpen:
Lightgun-Adapter:
VecLink Cable:
VecMulti card: 
VecVox: 
VecVox + USB Adapter:
VecMulti:
VecFlash (USB): 
Mateos Device:
Vectrex 32:
USB Adapter (Vectrex Joystick):
VecFlash Powerboard:
VecFlash (serial):
Joystick Kit:
1997 Development Kit Malban (Eprom Emulator parallel port):
PS2 Adapter (Keyboard):
PSX Adapter:
One of the earlier Sean Kelly:
Vec Adapt to use Sega joypads:
Didn’t know Clay Cowgill made a PSX adaptor for the Vectrex. Playing Black Widow or Robot Arena with 2 sticks possible.
If the last was a question – yes both possible.