Hi Roy,
Below are some dropship suppliers of laptop batteries, chargers, pads, and other electronic items:
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For clothing items, please see dropship suppliers below:
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Finding the right niche requires a lot of research. Knowing your target market and the specifications of the product/s you are selling will give you ideas on how to promote them. Start with your interests and list down items that relates to it. You can then join clubs or forums and read/listen to other members' views and treat it as a guide to start your own business.
Hope this helps.