Bulk YouTube To MP3 Conversion

I’ve got more than five-hundred videos saved from a recent YouTube Premium trial and I need each of them turned into an individual MP3. Standard quality (128 kbps) is all I’m after, so there’s no need for lossless or 320 kbps processing... (Budget: $10 - $30 USD, Jobs: Audio Editing, Audio Processing, Audio Production, Audio Services, Scripting, Software Development, Video Editing, YouTube)