Who knows.....it could be legit but money orders is what scammers use so I wouldn't do it.
Another thing you can look into is flying to pick up the cat and bringing him/her back with you. Some airlines let you put a small pet in a carrier under the seat like carry-on luggage. You would have to pay for your ticket plus a small pet fee but it's much safer than sending them in the luggage compartment. Also you pay when you pick up the cat so they can't scam you.
@Stevieraek hope you’ll see my pm. I had to edit the post cause we can’t name breeders on here. If you let us know which city the breeder you want to know about is, members can pm you to sare their experience.
Good luck in your search!