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I think your aluminium supplier is trying to scalp you. A specialty metal supplier near me, Surman metals, greenfields, S.A. charges about 12 dollars a kilo for aluminium 6061. At 2.7 gms per cubic cm your large piece is about 2.5 kgs so around 30-40 dollars, plus cut charge and gst. They also ship australia wide. Under 5 kilos is cheap.
I just purchased a slab for a mill fixture pallet over 4 kgs and that cost me 60 inc gst. Maybe shop around.
Al
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