I bought one yesterday for $430 and $15 in shipping straight from them, it will take 3 days to get here. The power supply is a few extra dollars, so based on that, I will offer you $400 plus shipping since it is a used piece of equipment too.
Their website still says it's $500. Can you provide some sort of verification that you paid $430 for this? I'm flexible on the price if this is legit.