Board Thread:Off-Topic Discussion/@comment-12229876-20131115151229/@comment-11490363-20131203234008

This forum seems to be pretty active:

http://appinvasion.com/index.php?forums/star-wars-force-collection/

You can trade before level 20 but you have to wait 2 weeks. You have to be allied with someone for 2 weeks before you can trade, so at least sign up and start adding allies.

They have  trade section as well!!!

People use Line for the actual negotiation, with the forum for posting have/want lists.