For those that want to get into Binaural recording

[abovethefirehouse]

This is a good place to get them.  I purchased many time from them..

http://www.soundprofessionals.com/cgi-bin/gold/category/110/mics

For those that require a bass roll off module
http://www.soundprofessionals.com/cgi-bin/gold/item/SP-SPSB-11

This removes the distortion from low end you can select the roll off frequency.

or purchase the Zoom h1 to record and built in roll off.