htwaits is correct. If you click through on the link in the listing you saw when searching at Amazon, you'll see is that the seller is "xpw" - an independent seller at Amazon Marketplace.
Once you do that, you'll see Other Buying Options on the right-hand side of the page.
Click on that and you'll see all the sellers using Amazon to offer that item, usually - but not this time - including Amazon itself - which appears to have taken down its own page for the Oppo.
In that list, there are also a few other Marketplace vendors at that price - but if you look further down the page you'll see Oppo itself selling it for $499.99.
You have to learn how to navigate at Amazon - for example, if you search for a Blu-ray and see it being offered for less by a Marketplace vendor, it may be another version - I bought a disk that turned out to be the Canadian version with none of the American version's extra features. There's little detail in those lists.
If you're looking at a very tempting vendor price, click on the vendor's name to get to its Amazon storefront and find the product there - that's where you'll find the detail page.
Last point: Amazon Marketplace sales don't get the benefit of Amazon Prime's free shipping.
So you can get it for $499.99 from Oppo either directly at Oppo.com or through Amazon Marketplace. Compare shipping costs (and speed) in deciding.
Edited by Philnick - 8/9/12 at 7:57am