Here is an article from http://www.theboatgalley.com that is worth reading.
West Marine has been offering price matching for almost a year, but I’ve found that there are still a lot of boaters who don’t know about it or how to take advantage of it. For international readers, West Marine is a large US chain of marine supplies stores.
West Marine offers price matching with retail competitors and, probably more importantly, all websites — Amazon and all those discount places. They require that the item be the same brand and model.