YOU MUST BE IN THE THEIVES GUILD!!!!!(high rank is best)In Chorrol (during the 
day) you will find honditar. Kill him. Then serve your time in jail or pay. Then 
locate his house outside of chorrol. go inside, steal all the steel arrows and 
equipt them. Shoot them all and pick them up. Then go into your menue and 
rapidly equipt/unequipt them they will increase rapidly. Sell them to your 
fence.you can only sellthem once( i.e. if u have 3k arrows and you sell 1,456 
all 3k will dissapear)