Have you heard of TechSoup? It should be one of your first stops as a nonprofit or charity. TechSoup is, in fact, a nonprofit itself. They manage a wealth of products/services that are available to you at a discount and sometimes for free.
One of the best examples is Google for Nonprofits. This is an incredible business-quality package of Google’s services, like email, calendar, etc. It is the same package that’s available to businesses as Google G Suite.