Originally Posted by 1varangian
I've understood the charisma score of whoever is speaking to the vendor matters. It doesn't use the highest cha automatically.

I have found this too in many different games.. better Charisma helps selling and buying prices.. In some games you need the character that is talking with the trader to have the highest charisma, in other games they use the leader of the party as the character you need to have the best charisma..