Hair straighteners and all other items needed for the straightening process can be purchased on eBay. You can choose from new and used items, and shop from private and commercial sellers. To begin shopping, head to the eBay home page. You may enter keywords into the search field, or click on any of the category links on the page. Both of these options can be used from subsequent search results pages to continue refining a search, and in many cases, a combination of the two provides the best results.