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40.000 Gp for the house.
50.000 Gp for the raw materials and equipment
1.2 million Gp for the magic items these guys always seem to have for buying magic items from the party.
The prices in the PHB are wacked, I'll tell you that much. They're pretty much accurate for an adventurer who walks into a town and says, "Ho there good merchant! I have 200 gold pieces and I want to spend it. How much are your wares?"
This isn't a big deal, but if you try for 100% accuracy you are going to have to have a lot of explaining and a lot of work to do. So don't feel bad if you have to fudge a lot of numbers.