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Looking for something like "stereo-input-trs-jack-1-4-splitter-4x-micro-amp-1-in-4-out-1-4-inch-headphone-amplifier-4-channel-audio-grey"? Here are the closest matches:
Moukey Headphone Amp Amplifier 4 Channels Metal Stereo Audio Amplifier,Mini Headphone amplifier portable - 4x Quarter Inch Balanced TRS Headphone Output and TRS Audio Input, DC5V Power Supply-MHAMP1
LZSIG Headphone Amplifier 4 Channel, Metal Stereo Audio Amplifier with Bass Boost, Mini Earphone Splitter with Power Adapter, 1/4" & 1/8" TRS Headphones Output & TRS Audio Input, DC 12V