A couple of questions to ask yourself:
#1--Is the deal too good to be true? Then it probably is...
#2--What kind of verification of the individual/item do I have? Feedback on Ebay is one thing. Pictures (NOT stock photos) of the item. Even here on ARF.com.--does the seller have several posts, or are they newly registered?
#3--How did the individual seem when you asked questions about the item--I like (even if I am 4 states away) to ask if I can stop by and see it..if the seller gets a bit cagey about that, then the warning flag goes up.
#4--And, finally, can you stand to lose the money? If it does go south, are you spending your Kids college tuition on something you hope to re-sell for a profit?
Paypal (regardless of the bad reputation it gets) is marginally safe--at least you can find out if the person is verified. Postal MO's MAY help--however, do your really think the Postal Inspectors are going to investigate every $50 transaction? And, finally, I do an Internet Search (white pages) on the address the guy gives--now, that is NOT definitive but might help. I have done it on myself when I moved, and it showed the tenants 2 guys before me. Escrow services may help, but the seller may not be willing to wait for his money.
AFARR