Whiteboard animation to introduce our product

We are looking for professional whiteboard animator who can do a animated introduction for your product.

The script for the same is ready. Just to give an example of what we are looking for, please have a look at the links below:

http://www.youtube.com/user/Ydraw2011?v=e6pqs0jKxKs
http://www.dunnhumby.com/uk/about-us-what-we-do
http://www.youtube.com/watch?v=zDZFcDGpL4U

The approximate duration for the animation would be 2 min. Please respond to this with samples of your previous work.