I thought I would send a response based on my experience in international trade, manufacturing, importing and sale of products based on niche markets and gaps in the market.

It would depend on a couple of things...

Are you going to make something?
Outsourcing to a country that has the experience in the foundation of the idea e.g. you want to make a certain type of teak wooden chair with legs that rock and a drink holder with an mp3 player in the arm rest.

Is it a technology or service idea you need help with the actual information needed?
Research with similar companies and competitors on the internet... nationally and internationally

Is it a brand new idea? or has it been done before?
If it a brand new idea then you could research similar industries and get information on their sources. You would then look for similar supplier companies you can test to your specifications and needs.
If it has been done before, then research on competitors in your local, national and international product markets.

Hope the above helps you in the right direction. I would be happy to discuss this in more detail or if you have any other questions you may have.

Nicholas Lord