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Looking for something like "10a-dc-dc-step-up-down-converter-module-boost-buck-5v-30v-to-0-5v-30v-for-audio-amplifiers"? Here are the closest matches:

DGZZI DC Converter Buck Module 12V to USB 5V 3A DC-DC Converter Step Down Adapter for Car

5-30V to 1.25-30V DC Step Up/Down Power Module - Buck-Boost Converter Voltage Regulator

Valefod XL6009 DC to DC Boost Converter 3.0-30V to 5-35V Step-up Transformer Power Module, Pack of 10