Foam cut to size. Melbourne based or delivery to Melbourne

Long time listener, first time poster.

I am looking to replace foam cushions and mattresses that are in an old camper van which I have just purchased. I am based in inner Melbourne. Considering one piece of foam will be large and for a double bed and the others are pretty standard size cushions, I suspect it will be smarter to purchase the foam locally. It seems to be a very expensive to have foam cut to size, does anyone have any suggestions of a cheap factory or something like that where I can have them cut to size. I would consider interstate purchase if they can deliver at a reasonable rate.

Thank you in advance.