I have 2 sets of used Hawk brake pads for the (pre '19) STI Brembo's. HP+ (about 8k Miles lots of AutoX, 1/2 life left) $20 Track Setup - DTC-70 ft, HT-10 rear (2 track days, about 1/2 life) $20 Located in NW Suburbs - text works best (6 Juan 2 - two for 7 - 177 too)
Just to be clear, prices are for full sets of pads (8 total each)! I grabbed pad thickness as well: (thickness to steel backing plate) HP+ = 0.35" avg Track Setup = 0.32" avg