We usually get a tax refund each year, and $500 of it goes into a separate account for me to use for books & curriculum, etc. And EVERY year, something else comes up that necessitates NOT spending that money as intended. This year it was our central A/C unit. In an ideal world, I would spend about $500 per year (more if I could get it :)) on books and such for my 2 dc (that's $500 total, not per kid), and would buy more stuff brand new. BUT the reality is that I wind up scaling my list WAY back, utilize the public library EXTENSIVELY, and what I do buy, I buy used -- not sure HOW my kids would react if I bought NEW, LOL!
But you know what? I homeschooled ER from 1st grade through 12th, and he finished high school with a 4.0 average, got a 30 on the ACT, and earned LOTS of scholarships, even though I spent VERY little on curriculum over the years. And judging by her work so far, I think EK is on the same path as her brother.