Valve made inventories private to friends only by default. Also when you but something from the Community Market or Mann. Co Store, it is not tradable for 7 days. It is harder to do, and harder to find profitable trades, but not impossible.
Currently the two best free scanners are Scan.TF and TF2Endgame.com
I don't really play in TF2 so I don't think I can trade in game which I don't play no?
Where is snow? Сука блэт сюда иди уебок! Ты мне нужен