This doesn't strike me as a very good deal.

.06 BTC * 500 chips = 30 BTC

500 chips * 280 MH/s = 140 GH/s

30 BTC * $127 (current USD/BTC on Bitstamp) = $3810

$3810 / 140 GH = ~$27/GH.

And that's just for chips. This is already a money loser before assembly + materials costs.