Graybeard,
I have a Sony TRV-330 which is a digital 8 camera that is about 4 years old. It has 25x optical zoom and it has a night vision mode called Nightshot as well as what they call Super Nightshot.
With Super Nightshot turned on the camera is rated at zero lux which means it will film in zero light. It is just like looking thru night vison goggles with that greenish hue. I normally just use the standard Night shot mode though when out in the woods with some available moonlight.
Using the Super Nightshot mode will illuminate the area alot more but it also slows down the speed of the film capture somewhat.
This night vision mode is actually an infra red beam that is projected by the camera and invisible to the naked eye. It is supposedly good to about 25 feet but I've had it on in the woods at night and it seems to reach farther than that. You can also order an attachment that kicks that range up to 100 feet or more. With Nightshot I have filmed in the woods at night when it was too dark to see with my naked eyes.
If you are talking about filiming under full moonlight in enough light that you can see something with your own eyes then these low lux cameras should work for you. If you're talking about filming in pitch black dark where you can't see where you're walking in the woods then your range would be limited to the range of the infra red beam.
You can still get Sony digital 8 cameras at Circuit City for like $300 if price is an issue, or their mini dv cams also probably have this Nightshot mode but they will cost a little more. You can also find these Sony cams that are a few years old on Ebay for a couple hundred bucks.
The movie processing is a piece of cake. I have used many different movie editing software packages. Some of the software can be complicated to use and some of it is very easy. It really depends on how much and what type of editing you want to do to the video. Adding fades between scenes or adding menus, text, titles of course adds some editing time.
Alot of times when I just want to upload a small film clip I just use the windows movie maker thats a part of Windows XP. It's easy and I can make small clips to upload for my friends to see in nothing flat. Because it's digital you can advance a frame at a time and save any frame to a digital still shot. It's very easy to do. Of course depending on what movie camera you have the megapixel of the still shot would vary. I've captured a few still shots from my videos that look great.
What you might want to do is buy a digital video camera at Circuit City and try it out. If you aren't happy with the results just return it. I have never had any problems returning anything there. In fact I bought a video camera there and after using it the first time I realized I didn't like it. I returned it and ended up spending a few more bucks for a better camera.
Hope you get some shots of that Bigfoot.
Here's a link to some video I took around the campfire a few weeks ago. This is just using the available fire and lantern light and I think I just had the standard Nightshot mode turned on. I was trying to find some videos with the Super Nightshot but I think I've recorded over top of those. This video is about 10 meg so you probably won't want to view it if you are on a dialup connection.
http://photos.imageevent.com/gsimpson/campoutfeb05videos/clipnum9.WMV