Rough numbers here:
$6k to concrete = $80m2 x 75m. So we are looking at 75m2.
75m2 paved under $1k = $13.30/m2.
Can you get materials to do 75m2 for under $10/m2? Lets assume you have to spend the other $3.30/m2 on tools/incidentals/topsand/cement.
I think a trip to Bunnings to get...