You can Try the Pricefox Dropshipping Market Research Tool
I just wanna let you think first about the strategy you will decide to go for..
You can do what 99% of Dropshippers do and this is to undercut competitors but it will not take you far since eBay algorithm in 2018 much harder with duplicated listings and "copy paste" strategies.
And you can invest little more of your time to learn how to make professional market research and use this skills to find opportunities and sell with high profit.
As more as you will invest in your knowledge you will have higher chances to make profit.