Efficiency

Level 5 of the Dungeon
(0, 0, D:5)
  16 gold pieces
(1, 6, D:5)
  a potion of curing

Level 6 of the Dungeon
[Shop] Erphep's Weapon Emporium
  a +2 long sword of electrocution (269 gold)
  21 stones (27 gold)
  a +0 hunting sling (19 gold)
  11 stones (14 gold)
  a +1 vorpal glaive (217 gold)
  a +0 falchion (39 gold)
  a +1 vorpal quarterstaff (169 gold)
  a +4 mace of protection (332 gold)
  21 stones (27 gold)
  12 bolts (31 gold)
  a +0 hand axe (39 gold)
  a +0 short sword (39 gold)
  9 stones (11 gold)
[Shop] Teris's Magic Scroll Shop
  (Shop contents are unknown)
[Shop] Tedem's Assorted Antiques
  (Shop contents are unknown)
(0, 0, D:6)
  9 gold pieces
(2, -6, D:6)
  a +0 spear
(8, 2, D:6)
  a scroll of amnesia
(9, -2, D:6)
  a potion of flight
(9, 2, D:6)
  a +0 battleaxe
(10, 0, D:6)
  9 gold pieces
(10, 2, D:6)
  a +1 plate armour of cold resistance
(21, 5, D:6)
  a +0 scale mail

Level 7 of the Dungeon
[Shop] Wur Diy's Distillery
  (Shop contents are unknown)
(0, 0, D:7)
  a book of Stone
(1, 10, D:7)
  7 gold pieces
(4, 3, D:7)
  a scroll of noise