|African Barbed Arrowhead|
Below are two videos demonstrating the traditional Hupa method, and also the Greek method using bronze casting. Both have their advantages and disadvantages.
There are lots of methods out there for making arrowheads - some people reuse old spoons for example, or nails, or any number of things that can be reworked, melted, cast, hammered, bent, and later sharpened into a good working arrowhead.
eg. Just take tinsnips and the some lids from metal cans and you can make some nice flat arrowheads very easily. Sharpen and they are good to use. (Somewhat disposable, but hey, they are also plentiful and easy to make.)