Right now when browsing the Trading Opportunities section, it will show me a lot of people I have either already traded with or already proposed a trade with (or canceled a trade with), which means I spend a lot of time comparing my Trade list page to the Trading Opportunities.

An easy solution would be an optional filter to hide users who you've already interacted with. Basically a show 'new opportunities.'

+1

Also filtering by friend would be amazing. Half of my play group is on Deckbox and I prefer to trade with them(locally). To do this I have to click on each of their pages to see what cards they have that are in my wishlist.

+1