I'm looking for some niche ecommerce ideas to open a new business here in Brazil. Preferably that has a good margin. Let me know your suggestion.
You are going to form a business around what interests a stranger? If I was you I would just quit while you are a head. Someone here can probably make a million dollars by selling paperclips with the right connections and knowledge....but that doesn't mean you would make a dollar doing the same! You should focus on what interests you then do the necessary research to see if there is a market. It's just silly to ask others to give you suggestions.... there would be no passion or drive!!!!! Because you asked such a silly question I don't think owning an ecommerce busuiness is ideal for you.
I kind of disagree with the post above (with all due respect). The very fact that you live in Brazil should give you some ideas...Brazilians are mad for football...there is one niche already and one that would sell abroad too. I know that I have a Brasil T-shirt somewhere...sambastyle.com (there you go, hope that helps a bit)
for ecommerce - try these designed t-shirts and similar products( cups/caps etc) you will need an epson workforce printer 7110 + heatpress board games, print some cool boardgames and sell them, very low cost, very high profit margin . some ideas *