I'd say the chances of getting it for under $500 are slim and none, and Slim is headed out of town.
I'd say $600 would be the price you would like to pay, UNLESS you would be linenbacking it, in which case you would be wiser to wait for a "vg" linenbacked one, which would likely cost $600 to $700.
Of course, the other bidders may not cooperate!