I haven't tried this, but it's amazing what you can get for free.

http://2go.point2.com/VirtualTours2GO.asp

"An attractive and professional virtual tour is automatically generated Copy the code that is generated and paste in onto any web page where you would like to display the virtual tour Repeat as often as you like, no charge

We’re offering Point2’s Virtual Tour creation engine, to anybody who would like to use it, at no charge, no matter what web solution you prefer."