If the one in your link is what you are after, buy that one.
Chris Hightower sells the cone/60deg included angle one, he also has a dished one for centralizing tips.
They are cheap enough just buy them.
The only way to get it cheaper is to make one yourself. If you make it yourself you can make it to exactly what you are wanting and from materials of your choice, ie brass or Ali or steel or plastic or something else.
Because I don't have the money to buy that one or a new one. If I knew how to make one I would. If you could give me an example or an idea of how to I would greatly appreciate it.