I think the MSRP for it was around $900 or 1000; which would make $500 a pretty hefty discount for the complete.
Better yet try to talk him down from $500 into the 400's to sweeten the deal.
Compared to a kilo this is a killer deal for a couple more dollars which you can save here and there. I would take this over a kilott any day. Kilo tt's can be had for cheap on craigslist besides...