There are some creative scam artists these days. Money orders or certified cashiers checks are useless these days needing the same clearance policies as a personal check. Think about the scanners and printers availalbe to anyone to duplicate anything very easily.
Heres some advice I picked up from other various forums. Using US postal service money orders can net you another area of law enforcment involvment under the laws of US postal fraud....
Heres is a high volume dealer who has had many scams tried and posts Crook updates for all to learn and read.
www.ronlund.com link to crook update....