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Amazon is selling trust there; in my experience, if the seller has a 96% or better rating you'll seldom be disappointed when it arrives, and they'll work hard to give you satisfaction if you aren't.

Much better than eBay in my family's experience.

If you have Prime, and click on that as a filter, that gives you fulfilled by amazon results... A lot of times I'll go another step and choose Amazon.com as the seller.

Amazon is pushing very hard to increase Fulfillment by Amazon coverage across the catalog, and is also releasing new products such as Seller-Fulfilled Prime. The customer experience is tightly controlled in both cases.