The U.S. Post Office charges a reasonable $1.25 for money orders up to $500, or $1.65 up to $1,000. Finally, Western Union doesn't have a set fee, but you may pay up to $1 for money orders up to $1,000. By now, you've probably noticed that money orders are usually capped at $1,000 or so.Apr 2, 2018read more >>