Amazon has the AmazonBasics Portable USB Condenser Microphone for $7.70 with free shipping for Prime members or on $25+. Retail price: $35.
Amazon has the SteelSeries Arctis 1 Wireless Gaming Headset (61512) for $80 with free shipping. LIst price: $100. Features noise-cancelling detachable mic, on-ear controls, steel-reinforced headband.
Has good Amazon Reviews.