43b78d2c_Spells__T2____Torchlight_Wiki__Effects
[Tome] Barter III [Description] Reduces the purchase prices at Merchants, Enchanters, and Gamblers. Improves the sale prices of your own goods. Only one Barter spell may be equipped at a time. [Required level] 31 [Effects] 
9% improvement in vendor prices
Spells (T2) - Torchlight Wiki
Effects