I've never seen rebates in Oz either.
But what I don't understand is ... when the manufacturer offers a sizable rebate ... it'd be more than the product was sold to the distributors in the first place!
Having a chat to some of the distributors here, they usually up the price by 20-500% depending on the price of the product. Then retailers add another 10-500% on top of that (again depending on price).
The only benefit would seem to be clearing out warehouses of old stock, which I suppose may be accumulating losses in terms of storage costs.