Camtasia videos - need native American

I'm looking for someone who can do a few marketing and instructional camtasia videos for me. Each video will be 1-5 minutes. Your first language must be english (American is preferable). I will require a voice sample for this with your bid. No bids will be considered without a sample, preferably a camtasia video with voice. You must be familiar with camtasia. Your bid should include 5 videos 2 minutes each.