Talking to the beggar Braham, if you ask him about the residence of Benthely of Welshrem (for me, this is the last question before the "farewell" option), he offers to tell you for 66gp. Any time I click on that, however, it charges me 665gp, instead of 66. This is shown in the little info box at the bottom of the screen, and using dialog save & checking my inventory, I can confirm it also takes the 665gp from me. Anyone else get this glitch and know a way to avoid it or something?

Edit: Having done a quest for the beggar, the price drops to "53" gp, and I wind up paying 535gp. So I think the glitch adds a 5 to the end of whatever you'll be paying, unfortunately.