Small or tiny budget mic for 5D Mark II?

I'm about to pick up a 5D Mark II and am shopping around for a small mic, without finding much luck.

My basic goals are:

1. Good enough to cut out lens sound and wind

2. Tiny!

3. Omni-directional? (don't think i want the narrow range of a shotgun)

4. Stereo

5. Under $100?

I've seen suggestions for the Sennheiser MKE 400 (below), but I'm interested in something even smaller than this, that I can just toss in any little compartment or even stow it away in my pocket.

Something like this size would be great:

Any recommendations?

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