You might consider reaching out to the people behind the Perspectives Project. They run 10 public notary servers [0], and chances are good that they have fingerprints for most of the widely-trafficked websites.

For example, here's the Perspectives report on lastpass.com showing the brand-new key as well as the old ones: http://i.imgur.com/hJkFTAy.png

[0]: http://perspectives-project.org/notary-servers/