I've rarely seen any FR-S/BRZs around but I saw two just today in the Puente Hills / Rowland Heights area.
1. Firestorm FR-S - Saw one parked at Target (Puente Hills) around 2pm near the front and had Whittier Toyota license plates.
2. Hot Lava FR-S - This might've been an employee at the Puente Hills Best Buy because the car was parked near the entrance and was still there when I left about 40 mins later. The car had tinted windows (all 5) and painted black factory rims. Saw this one around 3pm.
None of the drivers saw me pull in the stores with my Asphalt FR-S though.