SPH0645 I2S MEMS Microphone Breakout Output Module For Cortex M Zero
9,44 €
It's a 1.6-3.6V max device only, so not for use with 5V logic (its really unlikely you'd have a 5V-logic device with I2S anyways). Once you get past 8-bit micros, you will often find an I2S peripheral, that can take digital audio data in!
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