You can save money on fabric paint by making it at home, sometimes using products you already have on hand. This is a guide about homemade fabric paint.
Is there a way to make fabric paint out of other paints?
Yes, you can purchase a bottle of mix in that changes the acrylic paints (such as folk art etc) into fabric paint that can be washed, etc.
There is a special add in that you can add to craft paints to make them fabric paints. Look for it where craft paints are sold.