On Amazon.ca
it shows The Godfather trilogy being released on May 6th. Two things about this, May 6th isnt a DVD release day, so I dont know whats going on. And this is a REALLY good price, is there any difference between this and ones featured on deepdiscountdvd.com for example?

It may be a price drop.

its a price change...makes sense because all three titles will be available on their own, at a lower price (even though you would miss the bonus disc)