I think all white chocolate is "fake" because there is no chocolate in it. It's almost pure fat and sugar. The white discs are used for making candy and are widely available where fancy backing/cooking supplies are sold. Even Amazon has them:
http://www.amazon.com/Merckens-White...dp/B00067WBHC/ .
The discs make melting it easier than if it is in slab form. Most grocery stores also sell white chocolate chips (where the regular chocolate chips are) which would also work but would be a little more expensive.