We have all the PS-1 boards in stock. Go here; MTH Parts & Sales LLC Parts Search Page
Enter these part numbers;
AD4500001 (this is the PS1 bottom board)
AE4500001 (this is the top soundboard w/o the sound chip)
AE4500098 (sound chip for a Contemporary Tinplate 392 locomotive (there was only ever 1 sound file created!)
Order all of them or just what you need!
Thank you,
Mike Reagan
MTH Parts & Sales LLC