BuyDig via eBay offers the Audio-Technica Pro 24 Stereo Condenser Microphone
with free shipping
. That's $29 below our mention from five days ago and the best price we've seen. (It's a current low by $39.) It features two cardioid elements in X-Y configuration, 100Hz to 17kHz frequency response, battery-free operation, and 6-foot cable.