1)Join Arbor Day and get 10 free trees with a membership.
2)Plant swap with friends, church members,& family
3)Organize or join a plant swap group
4)Post an ad on craigslist for wanted plant starts or cuttings
5)Call up your local funeral home and offer to take any leftover plants that are getting thrown away.
6)Save your seeds from the year
7)Divide your current plants and repot them.
8)Visit http://www.freetreesandplants.com/ - this provides jobs to people with disabilities
9)Ask a local nature activity park if you can have a start from their plants on display.
10)ask a local nursery for their unsold plants that they are going to throw out.
11)Call up local landscape companies and ask for any job extras.