There are many ways to get them. ( videos will be added soon )
1- Pv ( Phoenix valley )'s last boss drops Epic coins and as well it's a really good place for EXP. (1-4 ecs )
2-Level 145 mobs which are found near Shrine of the Ancestors 215 224 ( by luck )
3-Rancor mobs ( check events )
http://epicpw.com/index.php?topic=7.0 ( by luck )
4-BH ( Bounty Hunter middle of archosaur ) gives 10 Epic coins + Divine Order of the Void quest ( blue void quest gives 50 epic coins, purple gives 100 epic coins )
5-Reaching room 60 in cube of fate gives you 15 epic coins
6-World quest gives 4 epic coins