[You Need a Thneed]

Originally Posted by Traditional_Ale

http://www.amazon.com/MXL-D-R-K-Desk.../dp/B000ASEHR4

It's a large diaphgram cardioid condenser microphone which runs on a 9V battery (for the phantom power) and comes with a cable that goes from XLR-F to 3.5mm. Should do the job nicely.

I have one for $150.

Cardioid isn't omnidirectional, though. If that mic is cardioid (I can't confirm), it won't be good to just sit in the middle of a table to pick up everyone sitting around the table.