expedition tutorials
If you can find an older version of Expedition (pre 2004??) they used to include a sample library. You can also buy a library from Optimum Design (**broken link removed**, you might try downloading the demo).
Personally, I have never been a fan of libraries built by someone else. They never tend to meet my companies standards and I am always worried about their accuracy. With Expedition, building your own libraries is a pretty simple once you get the hang of it and I think in the long run you will be happier.
Which front end tool are you using? DX Designer or Design Capture?