A simple solution is to compare the price on a site like Junglee.com. Or, check out the price at your neighbourhood store. You may get a better deal there, especially if you go for an exchange offer. Also, find out about the site's business model. Is it an e-retailer, where the site is the seller, or a trading platform such as ebay, where the site is just a middleman? In the latter, the guarantee comes from the seller and not the website facilitating the transaction. Similarly, complaints will have to be resolved with the seller, not the site that lists the product.