Does anyone know of a science cirric. that is in one book ...like a workbook? 

My kids really are into the workbook scence.  If I could cut my costs <and books> by having worksheets and info in one spot that would be lovely.

Real Science 4 Kids sort of is.

There's also AOP's Lifepacs.

Considering God's Creation is sort of like a workbook.  You use one teacher's guide (softcover) that's non-consumable, and the kids each use a consumable book.  (Or--you can buy one kid's book and make copies.)  The kids book is full of pages that come out and get filled in, cut out, pasted, etc. into projects to help them understand the science concept, and later get put into a 3-ring binder for each kid.  All the information you need to teach the lesson is in the softcover teacher's book.

The curriculum is designed to be used up to 6th grade.  When I first looked at it, I thought that it looked too simple to be "real" science.  However, when we started using it I was surprised to find how much science is packed into the pages.

We also used Considering God's Creation.  I loved the presentation, but there is a lot of religious material.  Some of it did not fit our world view so we skipped it (researching multiple bible passages with each topic and the authors do not believe in evolution.) 

My kids loved building their science notebooks.

We have considering God's creation too. It is very affordable.

Lifepacs have worked well for us.

LaDonna

If you are looking for a Christian program A Reason for Science is a workbook program.  I don't have any personal experience with it, but you can view sample pages online.