Marketplace
Some good deal seen at Bunnings Melton Vic:
14 Pack Sandpaper sheets - 50 cents
4 pcs grinding disk (115 mm) - $1
16 glass paper sanding sheets - $1
3 pcs Jig saw blades wood/steel - 50 cents
Mod: OP, please use the OzBargain or a reputable file uploader to show other pictures.
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Sandpaper available free at a council public toilet near you