Sometimes you will find press releases on the individual company sites, other times there will be an industry body the distributes news releases to all appropriate parties and usually they will make them freely available on their web site.
News.com.au-Property.html
For some niches you will find that there is an abundance of free press releases available. This is particularly true of the technology industry, but many other market places also generate significant volumes of news.
SMH.com.au-Business.html