Alan's original project http://www.g4jnt.com/9850DDS.htm gives some extra information.
I obtained a couple of sample AD chips at the time and also played with the AMQRP DDS-30 and DDS-60 modules and then the PIC-ELIII development board. Most of the modules I sold at GQRP Rishworth raly.
Anyway from ebay I bought half a dozen, just turned up.... not bad for £3 a piece. This is an image of the ebay listing.
The boards do look the same.
There are two 10 pin SIL pins either side so the boards can just plug into a breadboard. They come from china in a jiffy bag so watch out for the pins as some were bent.
An alternative method to drive is an Arduino version
http://nr8o.dhlpilotcentral.com/?p=83
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