Yes. Everything included.
Also because they are open source, the patterns for you to print and cut out are on the web.
Perhaps find a local cardboard packaging printing and cutting company that can do the job. You will need to buy the magnets and lenses as well.
When I clicked on your ebay...
Bought one off ebay for £1.50 including free p&p about 18 months ago. What I saw at the time was very good and probably improved with more resources to download the VR imagery to play with.