If you're after 240V leads to hook up to LOR AC boards then Bunnings currently has some 2m extension leads for $2 each. http://www.bunnings.com.au/arlec-2m-household-extension-lead_p4330418
This is cheaper than most 3 pin sockets that you'll find.
Masters has 3m ones for $3. https://www.masters.com.au/masters/navigation/product_details.jsp
This is cheaper than most 3 pin sockets that you'll find.
Masters has 3m ones for $3. https://www.masters.com.au/masters/navigation/product_details.jsp