If you live in New York State, you might be interested in the School Seedling Program offered by the Department of Environmental Conservation. All schools and school-sponsored organizations are eligible to receive 50 tree seedlings (for which you will need 1,800 square feet of space). If you have less space, you can get their Urban Wildlife Packet, which contains 30 seedlings for shrubs that are favorites of songbirds. You only need 900 square feet of space for the shrubs.
The seedlings must be used as part of an educational program and not just landscaping for the school. The deadline is March 31st. You can get the application and more information here.
Helping the environment for free? How could this get better?