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Don't know what Housing you have, or if you're needing the hot-shoe that the SP-350 provides, but I have a SP-310, which is the same camera exactly as the 8 meg pixel SP-350, but is a 7 meg pixel without the hot shoe, EVERYTHING else between between the SP350, and the SP310 is the same.
Olympus SP-310 Review: 1. Introduction: Digital Photography Review
I have 2 of the SP350's, (keeping them both) but shoot them in a Ikelite housing and use the hotshoe to fire a Ikelite strobe, the SP310 is a land based camera for my use, but works fine in my OLY PT-030 housing without an external strobe.......
let me know if you're interested. I also have a Sealife 960 fiber triggered strobe and single arm tray to offer too.
cheers.