[Luchsen]

Originally Posted by The Fifth Horseman

Write down how much money you have in that savegame.
Convert that to a hexadecimal value.
Search that in the save file.
If no results, reverse order of bytes (every two characters = byte, so 12 34 56 78 90 becomes 90 78 56 34 12).

Or use Cheat Engine or Poke.