The annual demand for a product is $450,000$ units. The manufacturer currently charges $$5$ per bottle, and the retailer incurs an annual holding cost of $10$ percent. Each time, the retailer orders $9,000$ units. The manufacturer has offered a discount of $$0\mathrm{.}10$ on all units purchased by retailers over the coming month. Assuming that the retailer would not pass the discount on to the customers, what would be the forward buy?