Best/Cheapest material to line my garage workshop walls

One of my projects is to line my garage walls properly so that I can hang cupboards, shelves properly. I have a 3 car garage that I want to turn into a workshop. It is a double brick garage. I am planning to line the garage wall with either plywood or floor boards. I've been searching for cheap 2nd hand floor board but I haven't found anything cheaper than new pine 140 x 19 board that I can get for $1.10 p/Lm. Do you guys think pine floor boards are a good choice and is there a cheaper alternative? I live in the SE melb area.


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