You might have gotten this out of your googling but just in case:
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Montessori and Waldorf have nothing to do with one another.Â
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Montessori as usually practiced is an effective method of group educating young children by providing them access to work stations that are self-correcting. In this way, children can advance through academic skills at their own rate. The materials are very cool and very expensive.  I personally do not use Montessori materials because my teacher - student ratio is 1:2 not 1:20 and it's not necessary for us.
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Waldorf as usually practiced is a group classroom environment meeting the requirements of Anthroposophy regarding proper incarnation of the soul. The academic approach is vary far off Montessori. Academics are delayed to frowned upon until what is it ... 2nd grade? And at my local Waldorf school the cutoff for the grade is in the spring, I believe, so May-August birthday 2nd graders at Waldorf would be third graders in the public schools. In contrast, Montessori students entering the public school system often have a noted "Montessori effect" -- they are usually working further ahead than age peers. It's just called an effect, because the public schools are confident that they can squash that progress right back down to age peers in just a few grades.
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I *get that* the main thing the two have in common is the group of parents that are drawn to them because when my children were small and I was researching schools, I was drawn to them both also as possible alternatives to traditional group education and as meeting a certain nostagic image I had of happy elementary education, free of all that standardized testing and excessive homework in the early grades. I also love expensive natural materials and dislike cartoon screenprints on clothing.Â
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The important thing to remember here is that when you are homeschooling, you do not face the challenge of group education. I run a very effective academic home school for my 7 and almost 6 year olds as a tutorial (apart from their outside classes in art, sports, dance, music...). We did not need learning toys or preschool curriculum to prepare for kindergarten work; they played with their regular toys and when they were old enough for lessons, lessons commenced and have not been very expensive to date.* If I suddenly had to educate ten of their friends in my home with them, the cost of managing all that per student would skyrocket, as would the number of hours needed in the school day, and of course I would likely change my approach.Â
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I think you should research unschooling, or consider how you could fit your academic goals into patterns of weekly activities that would meet your Waldorfy side; baking on Mondays for mathematics, nature hikes every Tuesday and Thursday for PE and science, knitting for mathematics and art. None of that is expensive. Also consider ways that your home school, like Montessori, will be differentiated for the abilities and interests of each child. That, because you are their mother, is not expensive either.
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I also encourage you to limit the plastic toys if they don't meet your aesthetics. Not many toys are that important and if you're like me, you're the adult most in the house and at your kids' age you are doing quite a bit of the picking up. So if you don't like a toy, get rid of it. Sell it on Craigslist or freecycle it and find simple basic toys you do like on Craigslist and freecycle.
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*There are things that are investments. Rosetta Stone, for example, is a language learning system that is easy to implement and many homeschools use. You might spend $600 or so for levels 1-5, but for two children, that works out to $5 per month per child for five academic years of foreign language, 30 minutes a day, five days a week, which is IME very inexpensive.