Started with a Xarcade Tankstick but upgraded several times before getting to my final result.
These parts were all bought new by me, but never used much, as I kept changing before I got to my final set up.
iPac2 with cable
2 IL Eurosticks
36 pushbuttons and microswitches
Full description and photos on eBay auction:
https://www.ebay.com/itm/303228571498