One of the reasons you may be having a hard time is there is very little science "required" in kindergarten. Here is an example I found describing the 4 science "requirements" for K in Common Core.
http://colaborativelearning.pbworks.com/w/page/32112575/Kindergarten%20Science (I just google searched this.) The guide I found of CA requirements is ONE page.
What I would take from this is that you don't have to try very hard to exceed "standards" in Science. And this may be why you are having a hard time finding program. What I would do is look for Elementary Science programs rather than ones specifically for K. Looks like lots of others have many good suggestions.
