Use recycled paper for your invitations and thank you cards.
What is a good way to save on your wedding cake? Fantasy in Frosting suggests for the main cake, "Opt for a smaller design that serves about half of your guests for a nice look and have the rest of the amount of cake needed in the kitchen."
You can have kitchen cakes with the flavor and filling of your choice and when it is plated, it looks just like the main cake! Fantasy in Frosting also notes, “your cake should not look too small for the amount of guests or for the room where the event is held.”