For cheap used auto parts i would check http://www.jlkautoparts.com if they dont already have the parts on their website they will add it on request.
Good website can offer good auto parts, but not all parts are at a cheap price. While these websites will offer some coupons for customers, and maybe you can get the part you need at a discount price from them.
Here is a simple list of the good websites I know: autozone.com, miparts.com. advanceautoparts.com, napaonline.com
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