Farm an area like the old dragon ball online, but instead of npc's respawning with dragon ball icon more frequently with low chance drop, the chances are now .5 for a mob to spawn as a dragon ball icon, with a 100% drop rate. ^ ^ Hope this helps.
I usually choose a specific area with low health mobs (saibaiman monsters are the best) and start killing them all until they respawn, i think this is the best method for db hunting
Okay, Thanks guys I really appreciate the tips!