The source for most all computer repair parts is eBay. Through eBay, you can find all parts necessary, from hard drives to screens, etc. Many companies and individuals are even working full-time selling computer parts on eBay. Ebay has been the main source of computer parts for all companies I have worked for.
Additionally other web sites selling parts to be considered include Google, Bing, and other search engines. For example, I was looking for a AMD CPU that I couldn't find for a reasonable price on eBay. So, instead, I used a search engine to find the part in Manchester. It was promptly posted and received also quickly. So, in order to find the right part, simply use a search engine as an additional source.
Usually for computer repairs, the necessary parts needed are hard drives, power supply units, and LCD's. A very lucrative business is laptop screen replacement because it still has a good profit margin and parts are available on eBay. The brand, notebookbitz sells on eBay.
At times, the same company sells on eBay and has a separate company web site as well. Strangely, sometimes prices on the company web site are higher than on eBay.
There are also companies that specialize in supplying parts for repair centres. These companies do not deal with small repair shops and they buy their parts from eBay.
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