Dark Dreams of Furiae - a new module for NWN:EE! Buy now
For some reason I couldn't find a reference for this:
I was trying to figure out which merchants have the best sale prices in bg1ee. Well I swept through them all in NearInfinity and they all markup by 50% (150% of base value) with the sole exception of Black Lily who marks up sales by 100% (200% of base value). She also has 10 Potions of Mastery Thievery.