Originally Posted by azraelck
+3/+4 tomes are the rare ones, even bound. You can only start seeing +3's in bound form out of Elite Abbot or Reaver's Fate raids, and +4's only drop in Elite Tower of Despair. Rarely, the festival coin turn ins can result in +4 tomes; someone on Khyber auctioned off a +4 STR tome during the last run. With tomes now staying through TR's, I bet that person is kicking themselves now.