Efficiency

Level 5 of the Dungeon
[Shop] Gorhih's Assorted Antiques
  (Shop contents are unknown)
(0, 0, D:5)
  a potion of ambrosia
(8, -5, D:5)
  a scroll of teleportation
(11, 6, D:5)
  a +0 hunting sling
(19, 10, D:5)
  13 gold pieces
(23, 17, D:5)
  11 gold pieces
(28, 14, D:5)
  a +0 hand axe

Level 6 of the Dungeon
(0, 0, D:6)
  a +0 robe
(37, -9, D:6)
  21 gold pieces