Amazon does not have DXs for sale. I used that link last year to put in an order. After 3 months they cancelled the order and credited my account with $20.
Apologies I was wrong (see HarryT's comment below). I was over at
www.the-ebook-reader.com and he posted this news as well, so I went and checked it out. The listing for the DX ereader at Amazon says it is in stock. I did a purchase of a DX then. It is used and my order was confirmed, with a definite shipment date of around the end of this week