I was wondering if anyone could suggest some ecommerce research tools to see how competitive a certain niche is. For example, say I wanted to start an ecommerce store and thought selling kids' watches could be a profitable niche. Is there a tool I can use to search how competitive this particular niche is? Ideally I'd be looking for something where I could find other websites selling this particular product and see if I could sell this product or do a better job than the competition. I know I could partially do this searching Google, but also a tool to recommend or show potentially profitable niches would be helpful as well. Any input would be appreciated, thanks!