Bosch dishwashers in the 300 series are available from the manufacturer's website, as well as from the websites of retailers such as Best Buy and Lowe's. As of 2015, the manufacturer does not offer a 300 plus series.
Dishwashers sold by Lowe's can be purchased online and in stores. Lowe's offers both a three-year and five-year warranty for purchase with the machine.
Bosch dishwashers purchased from Best Buy may be available for both direct delivery or store pickup. Best Buy offers a price-match guarantee for some models, such as the 300 Series 24-inch tall tub built-in dishwasher. Best Buy also offers warranty options.