The DIY enthusiast “Moosapotamus” posted plans on his website to build a pair of omni condenser microphones into two Neutrik XLR connectors.  The microphones use small Panasonic WM-61A electret-condenser capsules.

Notable Features:

• Extremely compact size
• Omni-directional

Price: no products offered

More info at moosapotamus.net.