I have bought a number of things on ebay (for discontinued or NLA parts, its the only source in many cases) and by using highly rated sellers I had good luck. I picked up bunch of NLA OMC Cobra parts (complete transom mount, spare outdrive, exhaust Y pipe, power steering assembly) and a spare intake marine intake manifold for my old 4.3 V6 for when the original rots out. But it can be a bit risky I guess. This saved me from having to convert my old boat to a merc or a volvo drive system, since I have everything that could go wrong with mine just sitting in the garage!