While the type of commodity and duty rate plays a major role in deciding which commodities to import, there are other equally important factors to consider.
Manufacturer
If the manufacturer has been sanctioned or there is an anti dumping case against a particular manufacturer, your venture could prove less profitable.
Country
Depending on the status of the exporting country in respect to the importing country, special trade agreements may offer additional savings in the way of duty free status as well as waiver of Customs fees.
Some trade agreements may expire while others do not. As an importer, you should always know the status of your seller as well as the exporting country as these factors, if negative, can drastically increase your costs.