My price tracker - Need help

[Stok3d]

I just learned about My Price Tracker when looking at a movie that I was trying to figure out to locate in iTunes / VUDU digitally on this website. Sadly, I can't figure out how to find O-Brother-Where-Art-Thou-Blu-ray/20917/ digitally. The only way I know to find movies and the pricing history is when i see them pop up in Best Movie Deals and I click the icon for pricing history under each picture--I love that icon!!!


So for my questions:
1. How can I insert digital movies (both VUDU & iTunes) into My Price Tracker. PriceTracker is something to follow movies and easily locate the pricing history correct?
2. How do I locate a pricing history (or even find a digital movie for that matter) of something that isn't a current sale. Let use O-Brother-Where-Art-Thou-Blu-ray as the example.

Thank you in advance for any assistance with the above