Same here. From the new pics posted by mobiledog, it appears the dorsal fin does not undulate as much as the lower fin. Great fish, nevertheless. And she's not camera-shy!
There's one on eBay right now. It's listed as a double fin black ghost knife. Looks pretty cool. But a 99.00 price tag, but you do get free shipping. I'd seriously think about it if I didn't have my 10 inch one