When I taught, I was working 10-12 hour days (some of this was due to my own inefficiency, and some of it was due to the massive inefficiency of the school in which I taught) and pulled in about $30k/year. Our salary schedule was such that the most I could earn without a doctorate was about $38k (after 20 years of experience).

That said, there are plenty of grant programs within schools. At least two of the districts in the city in which I live now have foundations set aside for things like this.