I have some 12 core 16/0.2mm (20AWG) cable for sale.

Number of Cores 12
CSA 0.5mm²
Voltage Rating 440Vac
Current Rating 2.5A
Insulation Material PVC
Outside Diameter 9.9mm
Screened No
Core Strands 16/0.2mm (20AWG)
I had to order 25m of it but I will only need 5m max. It should be the perfect cable for uber neat CP wiring

The 12 cores could be used for 6 buttons per player, 4 joystick micros (8/4 way) plus ground leaving one extra wire which could be a seventh button or start etc button.
Price will be £1.80/$3 per meter plus actual shipping.