Looking at the Amazon website today, I see the wait time has been changed for the Kindle DX from 3-4 weeks to 3-5 weeks, basically extending the potential wait time by one week (click here to see if it has changed), and the price is still $489.
As many of you know, Amazon also allows third-parties to sell their stuff (similar to eBay) on the Amazon website where Amazon will take a percentage of the sale. There is only one used Kindle DX listed on the Amazon website (click here to see it or if anyone else is listing a used one), for a whopping $849 – almost double the price of new!! With pricing like that, I would rather wait a few weeks….
Checking the eBay site, the most expensive one I see with free shipping is $649.85 with the Buy it Now feature (click here to see them ranked from highest-priced to lowest). There are many listed for less, so if you have to have one right now eBay may be your option.