If you aren't finding good suppliers in your niche on DSMOZ.com you can do some market research, figure out who your competitors are and see what brands they list and those will be the suppliers that you will want to contact. If you re-watch Module 7 in the 10 Day Advanced Plan we go a little bit into how to find suppliers. Here's the link - https://labs.dropshiplifestyle.com/bst/10-day-advanced-plan/
Hope that helps and please let us know if you have any other questions, thanks =)
Have a great day!