While the Toshiba? Satellite ? M305-S49052 14.1" Laptop (Refurbished) was the only one that had the REQUIRED DVDRW to complete the system, it is out of stock.

As to buying the OS. Are you sure? Most arrive with an OS installed and you never "buy" it but pay for a license. The difference is subtle but some continue to think they buy the OS.
Bob