Looks like the discount is either not active yet, or is not being applied correctly. Checked the Federal Corvette with a base price is 187,969,450. Since I have at least one Elite rank and the associated extra discount of 2.5%, the normal price in LYR space is ~155M, and that is the price I am seeing right now. At Jameson Memorial, the price is 164.9M, which is also the normal discount price (10% for JM, 2.5% for Elite rank). In a nearby Hudson control system, the price is 183.2M, again in line with the normal discount of 2.5%.
Federal Gunship and Federal Dropship show the same behaviour.