We have 2, 1st and 3rd. It is usually around $250-300 before we start in the Fall, then each term (I try and spread out costs) after that is another $150 or so. So $600 a year with books and things, curricula, art supplies, not including field trips or co-op/gas to co-op or CHEC fees. Our first year was much more.
But now we have our Math on the Level (pre-k thru pre-Algebra), and All About Spelling for several years, which are reusable and non-consumable:), Vos Children’s Bible, resource books for me… I make my own copywork packets using a free worksheet maker online and bind or staple, we have used the library extensively, although now I am buying more books for history and read-alouds so we can keep them and not have to rush thru. So true what a previous poster said about more money to get things ready made or more of your time to do it yourself, hunt down bargains, etc. So it depends what kind of a season you are in.