you could probably find a genuine one on ebay from overseas a lot cheaper than here in Australia unfortunately.
I had the same deal today with a gearshaft bearing. Genuine Yamaha part $28 del from the US, local Yamaha shop - $85
and retailers have the hide to complain about online sellers taking market share. This part is still taking up shelf space somewhere in the world so the storage/warehousing cost argument doesn't hold water. The service I recieve from on-line sellers is much better than that I get at the local bike shop too.