historical vwap data

Hi all

Does anyone know where i can access historical VWAP data for stocks on the ASX, preferably for free?.

I find the VWAP to be quite useful when assessing stocks that trade on quite a large daily range. It'd be good to have this tool so I know how valid some of the large shadows on candles are.

I've noticed that on CMC Markets the VWAP is shown on a daily basis but I can't seem to access historical VWAP data. I have comsec, e-trade and CMC accounts.

Thanks