Yes @cwow2, there are different types of trees in the Eden Reforestation Projects and some of them costs only 0.10$.
We've decided to plant the Mangroves because they doesn't cost too much but still does a great job in Madagascar!
As you can see on their website Mangrove forests are essential ecosystems whose dense roots serve as an anchor for the soil and coastline preventing erosion and creating a barrier between harsh ocean systems and land.