I know a few people that sell sunglasses online and they are doing great. You can get ideas from their websites www.polarizedoptics.com and www.polarized4u.com . If you concern about getting supplies to sell, google "sunglasses wholesale" will give you ideas where to buy them. You can buy a dozen for $25 then sell each pair for about $25. You don't have to reinvent the wheel, just follow their web structure.

Hope this will help.