A boom or scissor-arm stand with suspension mount ($30), a pop filter ($10), and USB condenser-type microphone at the bottom of the range of your chosen manufac

A boom or scissor-arm stand with suspension mount ($30), a pop filter ($10), and USB condenser-type microphone at the bottom of the range of your chosen manufacturer ($30-$100) will get you 80% of the way there. The cheapest $5-$20 microphones are cheap plastic USB crap with 5 cent dynamic transducers, but it's really a huge step up to something like the chunky, metal Samson C01UCW studio microphone, for only a little more money. The whole setup cost me $76.