Some people take the time to develop and write their own unit study. Most people I know aren't that ambitious! There are many unit studies to choose from. Some cost plenty of money and others are TOTALLY FREE!! I chose a unit study that was somewhere in the middle! (More about Learning Adventures)
There are several reasons why I went with a unit study this year. I can educate both Espressos at the same time. With unit studies, it is easy to adjust to multiple grade levels. The espressos are 2 grade levels apart and do GREAT! Also, it creates a desire to learn and makes learning fun. That was my real goal. To create a desire to learn and it is working!
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The unit study that we use: Learning Adventures (my review on LA)
Free: The Homeschool Mom Homeschool Helper Easy Fun School Fun Schooler Oklahoma Homeschool
Unit studies for purchase: Konos Christian Cottage My Father's World
Unit study reviews: Kathy Duffy