I've read some posts from people who were unable to find the bonus merchants,so go here
http://www.sorcerers.net/Games/BG2/index_editors2.htm
to find them.And for those who have never heard of them:after you install this,you can buy stuff from 2 merchants that came along with the bonus edition of the game.They sell very,very good stuff!!Just one word of advice:start saving a LOT of gold