As we seem to follow the United States in most trends these days you can be confident some movement of a similar nature will eventually raise its head in Australia. The debate should be interesting, not to mention the search for a low cost substitute. Before we go into the process of making your own sinkers, let me warn you the cost of lead, if purchased new, would hardly justify the time involved in making sinkers. Fortunately lead is always available on the second hand market. Your local plumber will also, from time to time, have pits and pieces he will sell.
Automotive batteries are another source of lead.
To salvage what you can from a battery requires the casing be broken up and the internal plates removed and melted. The battery will contain acid and other nasty stuff so gloves, glasses and care are required. Apart from lead you need a sinker mould or moulds, a metal ladle, a length of straight wire and a couple of clamps, preferably spring clamps. A convenient source of heat for melting the lead is your kitchen hot plates. If the kitchen is taboo a portable gas stove will do nicely.