For areas with little industry, you must begin with parents. The closer to home, the easier it is to get a grant or a gift. The bigger the company, the bigger the competition. Always start small. A classroom teacher has no other choice.
Most large grants go to consortiums of partners.
For example, last Friday my district was being recommended for funding by the California State Technology Literacy Challenge for 1.3 million dollars in year one. This was a proposal that was limited to 25 pages, included ten school districts, and a bunch of vendors and university support. I had to gain the support of a variety of people in a very short time. Being out of the classroom, I was able to do this. It took three weeks of 17-hour days.