2 months ago I contacted a seller on the b/s forum and after a few sms'es he agreed/confirmed to sell a camera to me at my offered price. We agreed to meet at Tampines mrt station 3 days later, as we were both busy at the time. On the day itself, I sms'ed him to let him know I was already on the way [I had already travelled for over 45 mins. from my home]. He sms'ed me back to say, "sorry, the cam had already been sold to another."
Lesson learnt: I guess "buyer beware" doesn't just refer to the quality of the item for sale, but to the character of the seller as well