Making a short video, need good audio on a budget

What the title says, but to expand:

I am making a video that will involve filming myself speaking for parts of it. I have the camera, but the built-in mic is of course crappy and there will probably be some background noise on location.

Need to decide whether my best bet will be to buy a small mic that clips onto my clothing, or to buy one that I plug into my computer, and try to do a sort of ADR in post and edit the audio track in (never tried this before so I don’t know how hard it will be to get a good sync between the audio and video).

Once that is decided, I need a recommendation for a good quality mic / recording system that won’t break the bank.

What kind of budget are you looking at? Are you going to use this more than once?

You can get a decent mic for probably under a $100. What kind of mic you are going to get depends on the budget.

Once you get the track on a PC you could useAudacity to edit the audio and output it in some different formats. This is free software. I’ve never used it, I’m a Pro Tools guy, but have heard decent things about it.

Slee

Yeah, I’ll use it more than once. I probably don’t want to spend more than $100 right now though. Which method would you recommend between clip-on mic at the filming location or recording the audio entirely in post? I know they do ADR all the time in movies but I am worried that it will be tricky to get what I record to match the video exactly if I do the latter method. Again I haven’t tried it before so this may be an unfounded fear and it’s really easy to do with no one the wiser.

This one will cost a little over $100 but not much more if you shop around. It is a real mic; you’ll see them on TV and in recording studios. The USB version uses its own sound card, doesn’t depend on the one in your computer. I use one to record acoustic music … best I’ve found.

AT2020 USB USB Cardioid Condenser Microphone

I see that microphone recommended all the time and still haven’t bought it.

If you’re going to record dialog with it, you should buy or build a pop screen. Simple ones from Amazon start at $15, or you can buy a cross-stitch frame from Michael’s and clamp two layers of pantyhose in it.