Air compressors have a number of uses. These machines turn power into kinetic energy by compressing air and releasing it in quick bursts. The most common public use of an air compressor is to inflate tires. Because it is a popular tool, finding compressor parts to repair a broken air compressor is pretty easy.
An increasingly common place to shop for compressor parts is on the internet. There are several websites run by manufacturers and independent retailers which sell compressor parts. Though the prices tend to be lower, the main disadvantage to buying online is you are not able to inspect the parts prior to purchase. However, online retailers usually have generous return policies to compensate for this.
Local retail stores also sell compressor parts. If you purchase the parts new, you would be able to take advantage of the manufacturer's warranty. If price is an issue, you can go to a retailer that specializes in selling used or refurbished equipment. The parts will be cheap but generally they will not be covered by the manufacturer's warranty.
To reduce the need to constantly replace the same part, try to stick with brands that are known for their quality. Business.com is a quality resource for information about compressor parts. Peruse the links on the left to explore the topic further.