Negotiations were my favourite feature before. Every season I bought a couple of players from my friends who are 2-3 levels above. For them, a player was maybe 39% or 19% but when I bought it, it was 99% with SA.
Nowadays I even don't look for them. Why waist 20+T for a 99% player who will become (unuseful) 79% at the beginning of a new season. Totally ruined very nice interactive game feature.