Being a long time Layo player and crafter, I've tasted all crafts in one form or another (buying or selling) I've come up with my own little guide lines, that were pretty solid.
Rings/Amulets +1 Save Against Disease 400/Exceptional 1200
+1 Save Against Poison 400/Exceptional 1200
+1 Save Against Cold/Fire/Electric/Acid 300/Exceptional 3000
+1 Vs. Mind Affecting/Death 500/Exceptional 3000
+1 Reflex/Fort/Will 1000/Exceptional 5000
+1 Ability Int, Wis, Str, Cha, Dex, and Con 3000/Exceptional 8000
Multiply the above prices by 4-5 for their greater cousins. Ie: Rings that give +2 Against Fire 12-1500, exceptional 12-15'000. Also, amulets sell for 0.5 x the base price (Ie: Amulet of +1 Disease save +200) more.
+2 Ability Int, Wis, Str, Cha, Dex, and Con 20'000-25'000/Exceptional 40'000/45'000 (The + or - 5000 is for those who supply diamonds)
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Enchantments Enchantments I, II, III, and IV for weapons.
Acid: I=5,000 II=10'000, III=20'000, IV=40'000
Fire: I=3'000, II=5'000, III=14'000, IV=25'000
Cold: I=3'000, II=5'000, III=14'000, IV=25'000
Electric: I=3000, II=5'000, III=14'000, IV=25'000
Silver: I=3'000, II 6'000, III 9'000, IV 12'000 (easy to make Via alchemy in comparison to other enchantment's but the stack with elements so pricing needs to be close there)
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Resistances: Fire I=5'000, Fire II-25'000
Electric I=5'000, Electric II=25'000
Acid I=5'000, Acid II=25'000
Cold I=5'000, Cold II=25'000
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Leather Tailored Goods Cougar Leather: 2'500 (+500 for hide/studded)
Black Bear Leather: 2'000 (+500 for hide/studded)
Jaguar Leather: 3'500 (+500 hide/studded)
Wolf Leather: 3'000 (+500-800 hide/studded)
Worg Leather: 4'000 (+500-800 hide/studded)
White Stag Leather: 5'000 (+1'000 hide/studded)
Brown Bear Leather: 4'000 (+500 hide/studded)
Leopard Leather: 4'000 (+500 hide/studded)
Lion Leather: 4'000 (+500 hide/studded)
Crag Leather: 5'000 (+500 hide/studded)
Panther Leather: 5'000 (+500 hide/studded)
Polar Leather: 25'000 (+1'500 hide/studded)
Grizzly Leather: 8'500 (+500-1000 hide/studded)
Malar Leather: 18'000 (+1'000-2'000 hide/studded)
Dire Wolf: 15'000 (+1000-1500 hide/studded)
Dire Tiger: 26'000 (+1'000-2'000 hide/studded)
Dire Bear: 26'000 (+2'000-3'500 hide/studded)
Hill Hound Armor: 24'000
Monk's Armor: 2'500 for Lesser, 12'000 for Normal, 25'000 for greater
Mage's Robes: 2'500 for Lesser, 12'000 for Normal, 25'000 for greater)
Rogues Armor: 3'000 for Lesser, 14'000 for Normal, 30'000 for greater)
Cougar Bag: 2'000
Crag Bag: 4'500
Lion Bag: 8'000-10'000
Malar Bag: 20'000-25'000
Gloves of Furry: 7'000-8'000 (Exceptional 20'000-25'000)
Belt of Cunning: 7'000-8'000 (Exceptional 20'000-25'000)
Boots of the Boar: 1'000-1'500
Boots of the Cougar: 1'000-1'500
Boots of the Arachnia: 5'000-7'000
Cape of the North: 6'000-8'000 (30'000 if enchanted with Cold Resistance II)
Cape of the Panther: 5'000 (10'000 is exceptional)
Lion Leather Gloves: 4'000
Malar Leathar Gloves: 10'000
Dire Bear Leathar Gloves: 20'000
Litch Claws: 16'000
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Weapons/Metal Armors: +1 Weapons: 3-5'000 (Metal and Wood)
+2 Weapons: 14-20'000 (Metal and Wood)
Weapons with enchantments add +3'000 for I, +5'000 for II, +12'000 for III, and +22'000 for IV
Compound Bow Cam: (Adding 1d6 Massive Criticals) 8'000 gold
Compound Bow Part I: 4'000 (+1 Mighty)
Compound Bow Part II: 10'000 (+2 Mighty)
Compound Bow Part III: 20'000 (+3 Mighty)
Iron Chain Shirt: 5'000 (+6'000 for Platinum, +20'000 for Adamantium, +32'000 for Colbat)
Iron Banded Mail: 7'000 (+6'000 for Platinum, +20'000 for Adamantium, +32'000 for Colbat)
Iron Half Plate: 8'000 (+6'000 for Platinum, +20'000 for Adamantium, +32'000 for Colbat)
Iron Full Plate: 9'000 (+6'000 for Platinum, +20'000 for Adamantium, +32'000 for Colbat)
Small Sheild: Iron 2'000, Adamantium 10'000
Medium Sheild: Iron 5'000, Adamantium 10'000
Large Sheild: Iron 8'000, Adamantium 12'000
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Scrolls/General Potions: First Circle: 100
Second Circle: 250
Third: 1'000
Fourth: 2'000-2'500
Fifth: 5'000-6'000
Sixth: 8'000-10'000
Seventh: 20'000
Eight: 30'000
Ninth: (In your dreams) 60'000
Potion of Cure Light Wounds: 20 for Self, 25 for Other
Potion of Cure Moderate Wounds: 30 for Self, 35 for Other
Potion of Cure Serious Wounds: 150 for Self, 200 for Other
Potion of Cure Critical Wounds: 300 for Self, 400 for Other
Potion of Heal: 2'000 for Self, 3'000 for Other
Potion of Invisibility: 2'500+
Potion of Speed: 1500+
Potion of Lesser Restoration: 1'500
Fire Bomb: 500+
Potion of Strength, Endurance, Wisdom, Intelligence, Dextarity, and Charisma: 200 Per bottle
Holy Water: 10 gold per bottle
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Infusing First Circle Wands: 2'000
Second Circle Wands: 4'000
Third Circle Wands: 8'000
Fourth Circle Wands: 10'000
Fifth Circle: 20'000
Anyway that's about all I have. These are the prices I usually use when selling, and the one's I expect when buying. Haggling is fine, but having people offer you a low price for an item! Undeard of! Sago being undercut by that much for Lion Leather armor is just not fair. Heck if the did that in the real world, I'd have m $10 game boy, and my $20 PS2. Haggling, cool, chargin squat for a very useful item, just because it's easy to make. Not! Gah this was fun! ZV-