Niche Scraper does offer you a trial. You can sign-up for a free account which you can use as long as you want. The only thing is that a free account does have some limitations. If you don't want these limitations, then I suggest upgrading to their pro membership.

How good is Ecomhunt?

Personally, I think Ecomhunt is great for dropshipping beginners who don't have much experience yet with their Facebook targeting, or who don't know what kind of products to sell. They will provide you with a lot of useful information with each winning dropshipping product that they publish.

How much does sell the trend cost?

Sell The Trend Pricing

Both payment plan options include a 7-day free trial. The monthly plan costs $39.97/month, and the annual plan as $32.97/month.