It is possible to purchase replacement parts for KitchenAid mixers online, as of 2015. Parts can be purchased directly from the KitchenAid website. There are also many sources of original equipment manufacturer parts, and parts that are not made by or for KitchenAid available online.
PartsSelect is one option that also offers instructional videos for some repairs. Aftermarket sources can offer substantial savings compared to original equipment manufacturer parts, but if a mixer is still under a KitchenAid warranty, using non-OEM parts could void that warranty, as stated on the KitchenAid website.
Some repairs, such as replacing a damaged or rusted mixing bowl are straightforward; others may require specialized tools and above-average handyman skills.