Thanks for the answer, Six!
It's pretty much what I've thought - no merchant there.
I do hate the "random scrolls" thing - the best ones only show up when you don't need 'em. In one game I found a Project Image and a True Sight in the very first dungeon; a Trigger in the Graveyard, a Sequencer in the Sewers, and a Mordenkainen's Sword in the Sahuagins of the Planar Sphere. But I was trying to solo a Ranger/Cleric, so the spells were useless... what a waste.