In the Sinister Stone of Sakkara, Lairs, etc. I see a lot of loot in the form of unholy symbols, bone fetishes, engraved human teeth, etc. These have significant cash value, e.g., 20 gp for a bone fetish, 60 for the human teeth, 100 for an unholy symbol. I think the symbols are silver and the bones and teeth have little value as materials, so this isn’t the melt-down value but the value of the items as is.
Who is buying this stuff? Do the characters have to find a secret market of worshippers of chaos to sell the symbols to? Do they need to find a collector of obscure curios to sell the teeth? The bone fetishes I can rationalize I guess: maybe ordinary people pay for them in the belief that they ward off bad luck or evil spirits.