I tried finding it for my BMW. All I could find was individual quarts for 10-11 a piece. I'm not paying 70 bucks to change my oil. That's two changes with Castrol.
This has been my experience as well. Lately I've been doing the FCP Euro lifetime warranty oil changes, so it costs me $13 in shipping basically per change. For other euro cars I service if I need to pick up oil it's been Castrol 0w40 or lately Valvoline Euro 5w40 as those have been the easiest to find. The last time I saw Pennzoil Euro it was at WalMart, and like you stated it was around 10-11 bucks a quart. They didn't even have the full 7 quarts I would need for my car, but then again my local WalMart isn't great at stocking oil.