Hosting a virtual author Skype visit is a lot easier than you may think, all you need (apart from a willing author at the other end of the Internet) is an Internet-enabled computer, the Skype VOIP program, a webcam, a microphone and for best effect an interactive whiteboard to project the image onto.
Skype is freely available to download for all major operating systems, you can download it here and you can pick up a microphone, speakers and basic webcam for under £20. The biggest problem that colleagues that I have spoken to in the past have had was being able to access Skype through their work computers. The only way to get around this is to cultivate a good working relationship with your IT team, or, failing that, speak to your manager or senior leadership team and ask them to speak to teh IT peaople for you after making a really good case as to why you need it.
The Internet has made the world smaller than ever and with many authors now having embraced social media, more and more are willing to go on an international tour without leaving their home.
Finding an author willing to virtually visit your school or library is as easy as going to the Skype an Author website.