Amazon.co.jp: VSKEY Noise Filter Cable Ring [10PCS] Anti-Interference Noise Filter Ferrite Core Choke Clip for Power Audio for Phones, TV, Speaker, Video, Radio, Audio Equipment, Appliances [10PCS 9.0mm] : Electronics
AC Power Cord Choke + Power Cord- 120VAC RFI Range: 1-30 MHz, -28 dB Noise Reduction, 15 Amp - Wall Wart RFI Noise Filter - Palomar Engineers®
USB 2.0 Cable Cord w/ Inline Noise Filter, Type A Male to Male [USBWIRE1] - $4.99 : Auber Instruments, Inc., Temperature control solutions for home and industry