I'm working on a few community food forest projects/sites at the planning stage now ourselves but I wanted to share what we are looking to do which is to source as much as possible from community donations. We are calling out for
perennial herbs, vegetables, berries, and fruit and nut trees from the
local community including cuttings we can propagate from. You might also try a donation letter to local nurseries. We are very specifically asking for drought tolerant species as well as species particularly suited/thriving in our local environment. There is also the Fruit Tree Planting Foundation I've looked into a little bit. Good luck!