Z E.

Importkey.com is one of the online tools that require a subscription to be able to search in their database. They have competitors like Panjiva which is a product of a reputable company like S&P where you get more features than importkey, such as map visualizations.
I paid $49.99, for one month, however you have limited amount of suppliers to view per day (only 20) and you have 2 years of history available.
A disadvantage is that duplicates are too much. Also user interface of some competitors is better.