screencast record

I have to create a video for my desktop app (how the services works and so on). Here's what i am looking for: 1. screencast/record my app (on destop browser). 2. US native person (for voiceover) 3. must have an iPhone - will be recording both desktop app and iPhone app (however, there's...

I am looking for a good microphone to screencast with camtasia. Internal Mic is not that good for recording. I searched on google and found this: But price is so high for me. Budget is $15-$20 . Can anyone suggest a good one within this price? Thanks. :)