Pretty much anything but the most ideal products are non- perishable, non fragile and those where the shipping costs are not going to blow your profit margins.
If you're really serious about starting an online business, you should base that business on your own personal skills or interests.
People who build their business around their own personal passions or experience almost always tend to achieve more success FASTER than people who don't.
The cheapest product for you to supply online is your knowledge. Don't sell your self short and say you have no knowledge.
Every single person has specialized knowledge or experience on something that could become the foundation of a successful online business.
However, if you find it difficult to pinpoint exactly what that specialized knowledge or experience is, don't worry! You're certainly not alone. Begin by making a list of all the jobs you've ever had, all the hobbies you've ever had, all the volunteer work you've ever done,all the times you've helped someone and felt really good about it, all the challenging situations you've experienced in life.
Then go through that list and use it to find where your areas of skills and interest lie.
Use the questions below to get you going.
Once you have finished, go over your answers, pay special attention to the ones you are most passionate about. These are the areas that are most likely to lead you to the ideal market you should target with your business.
Now narrow your list down to five topics you're truly passionate about. These topics are going to be the starting point of your research to find your niche market.
These topic's could be the beginning of a very successful business selling e-books on your specialised topic and remember it should be specialised so that you can target your niche market.