[Prices] Vendorbuy calculated wrong for goods bought in batches

[ProfessorMinius]

I've noticed that crafting vendor goods that are bought in bunches (such as Imbued Vials which are bought in batches of 5) are represented by the sum value instead of their individual prices. Example: 5 vials are bought for 2 gold and the price is calculated as 2 gold individually instead of 0.4 gold.