Hi! I just found LVL 40 focused heal 195% ED, I wish it was 55 )). Any idea on price, please? I am relatively new to the game.

Also, how do people trade outside of marketplace? If there is a forum post where people trade, how is that happening?

People do use the hc or sc trading sections 😎
You have the options of price checks there as well (apart from buying and selling).
Sc here
https://forums.d2jsp.org/forum.php?f=273

Thanks! I wanted to know how technically a trade is happening? Is there a way to send an item to a specific player? Or only marketplace?

Mainly mp. Otherwise, if people are in the same guild, i think they can use the guild vault as well to transfer.