Is the amount of money they have in inventory always the same, after they resupply?
For example, merchant A has 300 stygian coins, then player buys/sells some stuff.
When next time when merchant A resupplies, will his inventory have again get same 300 sygian coins, or there is some random factor involved?
Based on my limited testing, after resupply merchants always get same fixed amount of cash.
But it could be good if someone else can confirm this.
If it proves correct, I'm thinking about adding this info to the Underrail wiki. It should be useful when planning "trading" trips to sell some loot to know in advance the amount of cash you can earn from specific merchants.