With 4 kids, I'm thrifty. LOL. Here's a list of some craft items I keep on hand. Most can be found at the dollar store.
cardboard tubes/tp tubes
different size food boxes
leftover pieces of wood
milk jugs/juice cartons
It's amazing what you can make with what some people might call garbage! Take a look at what you are throwing away and stop to think if you can make a project out of it.