A lot of people in my office pay a large sum of money for virtual tours, and I will share with you what I shared with them.  You can do a Photo Story of your listings for free.  Download Microsoft Photo Story off the web and get started.  The only thing that I had to pay for was a head piece with microphone so I can put my voice into the video, and this is optional.  Once you create your Photo Story in a few simple steps, you then download it onto a video hosting site, such as YouTube and you are off to the races.  With all the advertising costs we have this is one way you can save.