Steve,
RJ probably has some extra PCB's available. You can check the DLA Store he will tell you what it will cost for the board and shipping. You'd need to order the parts yourself.
I'm in the same boat, in that I got a dongle board from RJ a few weeks ago, but still need to order parts.
I do have the advantage of already having an Entec USB DMX Pro in hand, which I can use for now. But I'll definitely be building the Lynx dongle sometime...