Re: How nuch do you spend?
I've spent about $400 on curriculum and materials for my 3 (6th, 4th and pre-k). This does not include extras like 4-H, competitive volleyball or robotics. DS also goes to 5 morning/week pre-k at a cost of $165/month.
If we had to send the kids back to the parochial school where they had been attending, it would have cost us $925 for sustaining fees for the 2 girls and $400/month for full day pre-k for DS (no part-time options). We also tithe to help cover the cost (which we do regardless of whether our kids attend school there or not).