free LIDAR-based data available for all of Sydney & coastal NSW on Geoscience Australia website
http://www.ga.gov.au/elvis/
presented as a nominal 5m grid, but there is a problem in the routines used for changing projections, which shows up as a regular grid over the contours or hill-shading produced using OCAD11. Not as good as the actual LIDAR data from LPI but good enough for first pass for new maps.