What Is The Playstation Video
Playstation vido is just a name I made up for the add on for the playstation, which allows you to play special "Playstation CD-ROMS" on your playstation with a adapter.

Where And How Much Can I Get It For
So far the only place that I know that you can get the CD-ROMS and the Adapter is at Banzai Anime. However, you have to go into the Store to buy it, since it is not avaliable on their website. The adapter costs about 20$ and the CD-ROMS cost $20 each. So far, I have Banzai Anime Has the first 2 volumns of the Slayers Next Series for the Playstation Video. Also you may be able to get the Slayers Playstation Video at animenation.