You might try Parts Rack or Viper Specialty. Parts Rack has some NOS pieces and could potentially have an ECM laying around. Viper Specialty does a lot of electronics work as well and might even be able to fix something for you.
Worlds fastest way to end up with an invalid core and cost yourself an extra $500. I get destroyed cores from those minimum wage morons on a daily basis, complete with broken cases, acid-damaged electronics and screwdriver pry marks right across the board because they dont have the first clue *** they are doing.