Gateway Personal Defense

A weapons store on Ilium.

Attaining a discount at this store is complicated, and requires a number of steps:

Import a Mass Effect 1 save game that dealt with Conrad Verner to completion.

Meet Conrad Vernerat the Eternity Bar. Initial dialogue option is not a factor.

Choose "What are you doing here" as second dialogue option.

Go to Gateway Personal Defense, and if your Paragon/Renegade score is high enough you will get the discount.