The NSW and SA Heron Associations maintain listings of boats for sale.  Interstate boats are also often listed on these sites.  Listings can be accessed by the following links:

NSW Boat Listing           SA Boat Listing

Herons for sale can often be found by searching in Gumtree for Heron in Boats  or Boats-from-AU.com under Heron

Here is a Heron buying guide that discusses the variations in Herons that come up for sale.

The National Association currently has Heron 10294 Boolong for sale (pictured left).  This boat is an as-new  Dinghy Sports hull with Freddy Foils, fully rigged with a Bermudan mast and set of MC sails.  She comes with a double road trailer and beach dolly.  Contact the Association through nationalsecretary@heronsailing.com.au if you are interested in this boat.