On the old site, it showed who the supplier is that listed it: "Listed by Supplier: OPURSTECH, added on 12/25/2011." (must've been a lonely christmas day)
The new DX.com layout doesn't have it. It does have this though
Note:Stock and Availability shown on this site is for your reference only. While we strive to provide the most accurate and timely stock and availability information, availability information may become out of date and may change between the time you added an item to cart and the time your order is received.
A quick google reveals...
"YangLight, YWLiveStyle, YWToys and OPURSTECH are all aliases of Yang, a supplier which is becoming more and more known for not supplying products for anything up to 10 weeks (or more) after the products are first listed on DX. If the item in listed as "In Stock: ships in 2 to 4 days" DX probably has it already so it should be shipped quickly. However, if it's a Yang product and it's listed as "Typically ships in 4 to 7 days" then you can expect a long delay. The delayed Yang items may hold up the rest of an order."