[Currently]

I usually deal in US Postal Money Orders.

The US Marshall Service and the Postal Inspectors take a very dim view of INTERSTATE MAIL FRAUD and that is a felony.

I cover my butt with tracking numbers and use their Overnight Mail.

Since it is a federal offense, most people are legit or don't touch the deal if it is shady. I actually had a money order returned to me once because they would not cash it. I suspected something was not right and I ended up with hot merchandise and my money back.

The USPS may not be the fastest to resolve an issue but they carry some serious weight when it comes to fraud.