Dewalt and Delta are no longer owned by the same company but they are essentially the same saw and the Deltas are still being serviced by Black & Decker (Aka Stanley/Dewalt/Porter Cable). There are a lot of issues with quality control on that saw and service all around from B&D over the past several years.
Your best bet may be to find one of the older reputable Delta models if you really want cheap. Other than that the 16" Excalibur by General International is the cheapest I would ever recommend... It's not much more expensive than a New Delta only it's a little smaller. They do make 21" and 30" models too.
You can find them at Woodcraft or at
http://seyco.com . The owner of Seyco takes them out of the box and fine tunes them for optimal blade motion but I can help you to do that yourself if you got one elsewhere.
Here's a thread discussing recent Dewalt issues (one of many).
http://www.scrollsawer.com/forum/tools-and-blades/40750.htm
Here's a thread about writing to the president of Dewalt informing him of the quality control issues with the saw of late.
http://www.scrollsawer.com/forum/tools-and-blades/40771.htm
If you are lucky and you get a good one, it's still a somewhat decent saw, although the front-to-back blade motion at best make it quite aggressive and in worse cases make it unusable.