Forget the rest and take a drive over the bridge to Oceanpaddler at Manly. Dean Gardiner owns it and sponsors/organises the 'King of the Harbour' (see current thread). Personally, I look to support the shops that sponsor local events. Under the same roof as AA's shop Balmoral Paddlesurf.
I got my PDF from Oceanpaddler and I'm sure it will be well stocked and the best advice available as well.