Mystery Science is offering access to free science curriculum for a year, worth $99, covering 2nd-5th grade.
I'm not familiar with the program myself, but it might be a nice adjunct
or alternative teaching approach for those who are looking for
something different and engaging.
If you enter 5 email addresses to invite
other "teachers", you get instant access to the free year, otherwise you
have to wait until later in August.
Here's the link: http://mys.ci/r/888813