I think you may still be viewing a cached version of the site, with that said, now sold out items will say "Sold Out" in some unobtrusive text on the general product pages;
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If you want to only see in stock items, the new sidebar actually has a filter for it that you can check off under the "Other" heading (any of those sidebar options in bold can be expanded or shrunk by clicking on their name), as well as for items with special promo free-shipping that would typically fall below our $300 minimum;
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And on the product page while it does not say "Sold Out" if the item is out of stock at this time it will permit you to add it to a personal wish list, and show the last listed pricing we have.
We will be adding a stock notification system in the next 72 hours or so once we review our options a bit more.
UPDATED
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