I would skip the "all in one" curriculums. What goals do you have for his first 3 years of "school" --I am referring to K-2nd grade.
In general, public school children will learn to decode words and move towards independently reading. They will learn basic math: patterns, adding, subtracting, telling time, and shapes. Science and social studies are generally a couple unit studies done during the year. Children will learn to write in print, form basic sentences, and exercise creative writing. Actually, our school district started putting more emphasis on writing recently. I think it is overkill (possibly common core related) and I am happy we aren't there anymore. Our public school has pretty much thrown in the towel regarding spelling. This, I think, is a bit sad. However, I didn't like the method they used before, so it isn't much of a loss.
I mention this because those goals can easily be accomplished with very little curriculum.
1. Continue to read to him--lots!
2. Find out what he is interested in. Get books about that, find an activity about that. This is the beginnings of a unit study.
3. Introduce him to something you think he might be interested in. If he doesn't respond well, drop it. If he shows interest, you have another unit study. If in #2
, he came up with something for science, I would find something about social studies for #3
. Here, we look at a different country each month. Find it on the map, find a couple facts, learn to count to 10 in the language, read folktales from the country, cook something from that country, and watch a children's video about that country.
4. Be his scribe as he makes up stories. Show him how you wrote the words. Teach him to write his name. If he resists writing, use sticks and form the letters. You can draw the letters on the sidewalk and have him run to them as you call their name. Keep things active.
Anyways, think of what you actually want him to learn. There can be value in some sit down work, but you don't want to kill the joy of learning either. Sometimes, feeling tied to a curriculum can kill a mom's joy of teaching too. My youngest just finished 2nd grade. We did the country study for social studies. We explored a variety of things for science. She also tagged along with her older sisters when their science interested her. She Wanted to do cursive, so she did a workbook for that. We use singapore math along with lots of hands on math. We used Explode the Code to reinforce phonics skills. I read to her daily, she read to me daily. Those were books that we had or that we got from the library. We wrote stories when the mood took us there. She liked to write letters, so she did that more often. Total "school" was about an hour a day (according to her). I think she was learning most of the day. She just thought of it as school when it involved a workbook or her reading to me. That was 2nd grade though. I think most of kindy can be done through play.
I have heard good things about Five in a Row though.