Whats a Good cheap microphone to record vocal into pc for a music?

Hi.. I want to make a demo and i wanted to know whats a good microphone to use to record a vocal into a song for my pc? I want one that is clear and not noisy like the cheap 10 dollar microphone. something that is 50 or under. And where can i buy it? Which store? I dont want to buy it through the internet..thx

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