(Update: This deal is no longer available from B&H. But keep reading for info about how to use this gear for awesome audio on your videos).
Initially, this article was about a deal where you could get a free mobile handheld audio recorder if you purchased a Sennheiser Wireless Mic System. that deal is no longer available. But you can obviously still buy these two products separately, which I recommend for getting the best sounding audio on you videos.
I'm always talking about how rare it is - in this day of easy HD video - to hear decent audio on otherwise great-looking videos. See our post How To Get Good Audio On Your Videos for several ways to to fix this problem.
Two of my suggestions involve using a lapel mic (to solve the all-important issue of getting the mic close to you mouth), and recording the audio separately from the video (since even when a camcorder DOES have an external mic input, it records pretty noisy audio).
So in order to get the best quality audio, you record it onto a device that is specifically designed to record pro audio, such as a digital mobile recorder like the Zoom H4n.
Then when you are editing/producing the video, you simply import the audio from the Zoom into the video program, just underneath the audio recorded by the camcorder's built-in mic (which will almost certainly sound bad, with a far away, echo-y or reverb-y quality).
If your camera has an external mic input, you can plug the H4n (Or more recent H5) directly into the camera from its (the H4 or 5) Line Out with a mini-stereo cable. Then you will have excellent audio directly recorded onto your video!
You can then sync the "good" audio up with the camcorder audio track and then mute/delete that camcorder audio, and presto! You're left with a good video AND good audio.
With a wireless mic system combined with a Zoom H4N, you can do exactly as I describe above. The lapel mic will transmit to the wireless pack at the camera, which you then can record into the Zoom H4n. You won't need to hunt for a camera with an external microphone input because you'll have all you need to capture pro audio on all your videos.