Next time should meet up with the sellers at their homes. Take the extra trouble, let's not consider our convenience and ask the sellers to meet us, or meet somewhere in between. For all we know, this Raj may even be from Johor but come all the way to Kepong to make an easy 900 bucks.
If we meet them at their homes, at least we know where to send the molotov cocktails if we ever get screwed.