I've done several types of product research before for Amazon and I have the patience to endure long hours just to get the information and the product we are looking for.
I have experience product development as well, from product research to sourcing a supplier and the development of the products for private labeling.
I do have certain criteria on how to evaluate the products with high demand and low competition.
The tools I've used for research are:
Jungle Scout
Helium 10
Viral Launch
Sellics
I'm willing to learn more strategy on how to source a perfect product to sell or to develop.