The Arbor Day grant foundation funds tree planting programs. A cost share program with residents/businesses for replacement trees in front of their properties. Maintenance and warranty of trees is significant portion of new tree cost, you could remove this from the contract and have property owners who really want replacement trees commit to that maintenance themselves, i.e.: fencing, watering, wrapping, staking, etc.Other ideas might be a community tree fund raising drive. Or you could contact and ask for help from community civic clubs. Let them know that in 2018 the City will be undergoing a major tree planting campaign and that additional funding is needed.Starting with smaller trees is an option but also a bit of a risk. You could also purchase the trees yourself and plant with city crews.If you are looking to the future you could start your own nursery of trees starting small and using those as stock in the years ahead.Hope this gives you a few ideas.