What are the chances of getting sick from blender made hollandaise?

You can purchase pasteurized whole eggs in a standard carton at many US grocery stores. Davidson's/Safest Choice is the brand I've seen. They're pretty clearly labelled as pasteurized. Unless an eater has a weakened immune system, though, odds are really, really, really slim there will be any medical problems from home-use eggs that haven't been pasteurized and have been stored properly. Despite knowing that, though, when I use less than fully cooked eggs for a crowd I find the Davidson's.

Unless you have a compromised immune system or other serious health issues, You should be fine. If in doubt check with your physician.

If your eggs are fresh and from a clean farm there is little risk.