What's the best video editing software you can get for under $100?

That depends whether your looking to get it legally or not.

Generally, I'd think that for about $85 Sony Vegas Movie Studio 9 would be your best bet, here's the link:

http://www.sonycreativesoftware.com/moviestudiope

Of course, if you're willing to crack it illegally, the possibilities are endless and you could get pretty much anything.

You may try this Video Editor, it's a nice video editing software that can help you edit, join, trim, crop, convert and cut video, my friends recommend it to me, It's about $60. I had made a video with it and the video got award, that's pretty cool. And here is the free download link

http://www.avs4you.com/AVS-Video-Editor.aspx?sct=a...

For more video editing software alternatives, you may refer to this video editor review

http://video-editor.reviewstown.com/video-editor-r...

Hope it helps. Contact me if you have any other question