One of them (Deidre - Adventurer's Mart) sells items from Planescape: Torment. The other (Joluv - Copper Coronet) sells items from Icewind Dale.
Some examples of the stuff they sell:
Sling of Everard (+5, no ammo needed).
Shield of Balduran (relects beholder rays back to the beholder).
Robe of Vecna (good robe for mages)
Etc.
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"Butt-kicking for goodness!" - Minsc
"Cities always teem with evil and decay. Let's give it a good shake and SEE WHAT FALLS OUT!!" - Minsc
