The best way to avoid a fraudulent transaction is to get yourself educated. The Internet is full of helpful tips to avoid scams and such. There are many indications when a person is offering you a scam – the most evident being that the person does not want to release information, such as address, numbers and other revealing information. This is the first indication, however there are many more that when you can discover them, will help you to avoid that expensive scam.
The best advice also: when under pressure, take your time. These are the moments that the scam artist can take advantage of you. Get full contracts with full details and referrals and ensure to wait for these – don't go rushing off into a deal until you are sure it is genuine. And always ask for a receipt when handing over cash money. This one is from personal experience.