Cheap desk grommets?

I'm looking for some 60-80mm (18-20mm depth) desk grommets. If you are wondering what I'm going on about these are found on most computer desks. They are the plastic holes you can feed wires or cords through. Bunnings, jaycar, DSE all have them but at ridiculous prices ($9-$10) for a piece of plastic that no doubt cost 50c to make. Ebay has a bargain or two but shipping kills the value. I need to get 4 of these so for some stupid bits of plastic it's $40 and the budget is tight. Anyone know...

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