Hey folks, thought I'd post this here before trying on eBay 
I bought this device (it's only the round plexiglass part in the pic-not the cable) to use with my Canon A590 P&S and my Nikonos SB-102 flash, and it worked great. I used it underwater one time, and have since upgraded my whole setup to a DSLR so it's no longer needed.
If you don't know, this device attaches to the end of your nikonos strobe cable, and when you mount it externally to your housing (see above sample pic) it will trigger the nikonos flash via the P&S flash in-housing, and utilize TTL technology. It's pretty amazing.
It sells for $159 new (at Reef Photo in USA), I'll sell it for $100 shipped and paypaled to anywhere in US. I may need to look at shipping to outside US to add additional shipping costs.
I have 100% ebay rating, just search so_fl 
Here's the manufacturer's Site: (note there's a PDF manual here too):
Here is the manufacturer's camera compatibility list:
Shoot me an email if you have any questions. Thanks!
John
