Insulation for Shed

G'Day all, I've (finally...:~) got my 3x3m shed up and ready for benches etc to go in.
But before I do that I want to insulate it somewhat.
I spied some polystyrene sheets sandwiched in foil at my local second hand yard a while ago but didn't grab them, went back and of course... gone!
Can anyone suggest somewhere to get sheets of polystyrene in Melbourne, northern burbs preferred? (I've been told it's a great insulator... great for glueing to the shed roof).
I plan to power it up soon and get some benches and lights in there. It will be used as a workshop/hobby room for my slot cars, the track takes up half of the double garage (converted to a rumpus room).

Cheers,
Dick


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