Nice hunting. I found the rear pads for 197.50 euros from Riga, Lithuania.
RS29 fronts for my Stoptech cost $440 at TopBrakes, only $90 more than Hawk. I will definitely try them next.
edit: Actually, I'd like to hear how well the Pagids work for swapping back and forth with street pads. The Hawks get very abrasive cold, which cleans off the rotors before and after an event. Pagids are ceramic based, so they should be very easy on rotors but maybe not so good at bedding in after my Cool Carbon street pads.
...adding: Hunting around, I see one popular approach with ceramic Pagid or Carbotech pads is to take the street pads off and drive one day with cold Hawk Blues to clean the rotors before putting the Pagids or Carbotechs on. Otherwise, you can brush the rotors clean or swap rotors too when you swap the pads.