They have a GREAT website at http://www.harborfreight.com. I buy tons of
stuff from them, very happy so far. I haven't found much there that is
strictly marine-related (unless you count the Mig welder i just bought that
can do stainless and aluminum!) but for tools and whatnot they are hard to
beat (heck, they are hard to even come close) on prices.
My only complaint is that shipping takes forever, but since shipping is free
for orders over $50, its not a huge problem.