Once you know what part you need you can then go ahead and buy it. This need not be difficult if you have a computer and Internet connection. There are many spare parts stores online; all you need is the name and model number of the part to order it and it will usually arrive on the doorstep within a few days.
Whatever you decide to do, be sure that you're making an informed decision. Whether you opt to try your hand at DIY Maytag washing machine repair or you choose to scrap the old, worn-out unit in favor of a shinier model, it's your responsibility as a consumer to educate yourself about all of the available options.