Super amazing Vectrex collection listed on eBay:
https://www.ebay.com/sch/m.html?_ssn=jasonbar&_sop=10

Console: buzz reduction mod, pause mod, cap kit, clean, Minestorm overlay, tons of documents, modern dust cover
45 overlays & sleeves, 21 manuals
Madtronix 3D Imager: color wheels, three 3D game manuals
Madtronix Flicker adapter: for LCD shutter glasses (like Sega Master System's)
Controller
Light pen: three light pen game manuals
VecMulti
2X Atari driving controller (compatible w/ some Vectrex games/hacks)

[And still some Sony & NEC items there too, not to mention some interesting LEGO]
Thanks