Neil:
In his video, Bill just used the RGB Pixel (and its associated power injector) as a test-bed for the dongle -- you can use any DMX device to check that the dongle is working.
It is something of a chicken-and-egg conundrum though -- if you've built a Lynx Express, for example, and a Lynx Dongle and haven't tested either against a known working device and they don't work, you will have a difficult time figuring out which is the broke one.
If you really want an RGB Pixel, they're at
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LoginThough just looking around, it appears John doesn't have any to sell right now.
HTH.
\dmc