Miniature Slip Ring - 12mm diameter, 12 wires, max 240V @ 2A : ID 1195 : $24.95 : Adafruit Industries, Unique & fun DIY electronics and kits
SENRING Mini Slip Ring Electric Signal Transmission Rotary Joint OD 12.5mm 6 Wires 150RPM 240VDC/VAC for monitor Robotic (6 Wire 1.5A) - Amazon.com
SENRING Mini Slip Ring Electric Signal Transmission Rotary Joint OD 12.5mm 18 Wires 1.5Amp 150RPM 240VDC/VAC for monitor Robotic (18 Wire 1.5A) - Amazon.com