Molten Core --> 2 - 3k gold per run. All the blue and green materials sell nice usually. The boe lvl 60 epixx sell for 50 - 100 gold on my server. The lava cores and fiery cores sell at 50 gold each and you get about 10 -15 of each per run. Sulfuron ingot sells for 750 - 900 gold and has 25% drop chance. Remember to kill all the trash. I usually make several really big trash pulls and magma totem them to death.

BWL --> about 2k gold per run. You only need to kill the trash and all the boses until you reach the last boss, you don't need to kill the last boss there if you don't want. Elementium ore sells for 500 - 750 gold on my server. You get about 2 -4 of them per run. The first bwl boss is tricky, all the others can be brute forced easy. Elementium ore drops from trash after the supression room and before Chromagus.