For today only (4/3/09) 6ave.com is offering the Shure sound isolating earphones (model no. SE110-K ) for $76.  That's $53.95 off the original price of $129.95 and the lowest price we have seen on these headphones by about $10.  FREE shipping is included and sales tax applies for New York residents. 

The Sennheiser Street dynamic stereo earphones are priced at $27.50 with FREE shipping at Buy.com.

TheNerds.net has the JVC noise canceling earphones for $18.99 with $9.99 for shipping.

The Shure sound isolating earphones feature balanced MicroSpeakers that deliver optimized audio for a rich lifelike sound.  The sound isolating sleeves block over 90% of ambient noise.  The overall maximum frequency response is 17.5kHz, while the minimum frequency response is at 22Hz.  These headphones are backed by a two year warranty from Sure.  Cable length: 18in.