Torchlight/Enchanting

N is the number of the times that an item was enchanted

• Vendor price: $Base Price \times (1 + 0.25 \times N)$
• Shrine price: 0

Items General Info has a list of base prices based on level.

• Vendor failure rate: $N \times 2%$
• Shrine failure rate: $N%$

Barter does not influence enchanting prices contrary to what the skill help says.