You can opt to buy juicers through Ebay, if you've already searched through juicers, reviews, and pricing to find exactly what you want. Keep in mind though, unless you're looking to buy used juicers, you're probably going to find pretty near the same prices as you would anywhere else, and possibly without the guarantees. Bottom line, Ebay may be great for many things, but it's probably not the best bet to buy juicers.
You can buy juicers directly from a store as well. This is not a bad option at all. You do get whatever return guarantees the store offers, and the trusted name. What they don't offer is varieties of juicers, reviews, and ratings to help you decide. You also may not be able to buy the juicers at the lowest price possible. So research juicers, reviews, and pricing before you go to buy juicers!
You can also buy juicers through the company website. This is not a bad idea either. Buying the juicer from their website will ensure any warranties will not be voided. If you've researched any juicers or reviews, you know that some companies will quickly void warranties! If you buy juicers from the company website, remember the juicers reviews could be biased, faked, or embellished. So don't base your research off just the company's website of juicers and reviews.
You can also buy juicers from Amazon. This method is highly recommended as well. You can browse juicers, reviews, and pricing there. You also know they are a trusted name to buy juicers from. It's at least a great place to do some research. The problem is, you can literally get caught up in hours of research going over juicers, reviews, and pricing before you get to buy juicers. You can save time by going to some juicers reviews sites before you buy juicers!