As one of its daily deals, Musician's Friend offers the used IK Multimedia iRig Mic for iPhone / iPod touch / iPad, model no. IP-IRIG-MIC-APL, for $29.99 with free shipping. That's $15 under the lowest total price we could find for a new unit. This unidirectional condenser microphone features vocal and instrument processing, a dual mini-jack connector, metal housing, and more. Deal ends today.

Of note, no warranty information is provided.