Aquarium Gravel/Pebbles

[avla]

Hi melbournemaniacs,

I need about 40 kg of good gravel for a big fish tank
what is the smartest way to obtain it?
Usual petshop price is about $35 for 10 kg bag.
Are there any cheaper options available?
And I need some additional beautiful pebbles/stones to decorate the fish tank.
Maybe do you know a good pebble beach or something?

Thanks in advance
and Happy New Year