BuyDig offers the refurbished Audio-Technica Cardioid Dynamic Vocal / Instrument Microphone, model no. ATR-1500, for $14.99 with free shipping. That's the lowest total price we could find for a new model by $17. It features a cardioid polar pattern which purports to reduce sounds from the sides and rear, frequency response of 60Hz to 15kHz, on/off switch, stand clamp, and detachable cable.

Note: No warranty information is provided.