This is a little minor spoiler having to do with the Underdark and the Assylum.
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I have just finished the assylum and the underdark, those are so far the most annoying and hardest places to take on, I have seen yet. However it is a great place for a nice penny. I have gained 7 rogue stones and one king's tear. The complete set of rogue stones have yet to be completed and accounted for yet, so if you have something to add then do so. The Assylum Rogue stones are found somewhere in the building, I can't remember exactly, but I have counted two, one I believe in the warden office, if you go back in, and one more in the dungeon area. Then when you enter the underdark you can acheieve 2 from the mind flayer city, 3 from the Matron Mother, and 3 from the prince of the strange ppl you run into just before you get out of the Underdark. The tear of the king is in the Underdark but I have gather my thoughts on where. If you have anything to add, or think I should change something because my info is wrong or is missing some good points then do so post here please. I just wanted to show some of this.
Rogue stones (MiNoR SPOILER)
Money has never been any problem in BG2 when you get the the underdark.... you can hardly buy any good goods during the period of leaving Athkatlan until you reach Ust'Natha. You can however sell loads of goods you boost your gold count into the hundreds of thousands which come in quite handy in The adventurere's marts extanded stash and also in TOB
Rougue TSones ofcourse add alot to this usm 
"Those who control the past control the future, those who control the present control the past" And I rule the PRESENT!!
I put the 'laughter' back in 'slaughter'
I put the 'laughter' back in 'slaughter'