Vending Expert

Vending Expert is a Engineering Tonic that lowers the price of items that you buy at the vending machine. It can be really helpful to those who prefer guns over plasmids.

Although mentioned on the Bioshock Official Page, Vending Expert was not in the original shipped game. It was added in the 1.1 patch

GG desc: "(Downloaded) Reduces PRICES in VENDING Machines."

price:
 * in PP: 1

sample data: lowered price of unhacked med kit from 20 to 18, and grenade from 60 to 55