In BioShock, the Vending Expert Tonics are only available after installing the 1.1 patch and DLC for PC and Xbox 360 versions.
Both versions of this tonic can be used together (~36%). In comparison hacking provides a 25% discount and also opens up more options. Using both versions and hacking the Vending Machine will reduce the price to less than half its original.
Vending Expert
“
With the Vending Expert tonic altering your EM signature, you can fool the pricing circuits at any vending machine. Known to our customers as "Circus Maximus," Vending Expert will pay for itself in no time!
”
Effect:
Provides a slight reduction to prices in vending machines. (~15%)
Corporate conspiracies let the "important" people negotiate better prices for themselves at all of our vending machines. Is that fair? You know it isn't! Get a taste of how the better half lives, with Vending Expert 2.
”
Effect:
Provides a significant reduction to prices in vending machines. (~22.5%)
Location:
First available for purchase from a Gatherer's Garden in Hephaestus.
Both versions of this tonic can be used together (~25%). In comparison hacking provides a 20% discount. Using both versions, Thrifty Hacker and hacking the Vending Machine will reduce the price to than half its original.
Vending Expert
“
Enjoy a special discount at all of Rapture's vending machines.
”
Effect:
Provides a slight reduction to prices in vending machines. (~10%)
Location:
Found hanging from a rope below the stairwell in the southwest corner of Plaza Hedone in Siren Alley. Can also be purchased at Gatherer's Gardens in later levels.
Cost:
75 ADAM
Vending Expert 2
“
Watch your dollars go even further with Vending Expert 2. Enjoy rock bottom prices from all of Rapture's vending machines.
”
Effect:
Provides a significant reduction to prices in vending machines. (~15%)