I think it would be awesome to have marked somewhere who you've traded with and how many trades you have completed in the past. Would be very useful to know who I already trust when trading.

A visual indicator for # of trades together, friend status, & common communities would be helpful.

Also being able to filter Trading Opportunities by "have completed X trades with trader", "is friend", or "is in community Y" would be helpful.

What about adding sealed product?