I just looked on the web site, and it looks like that price is for the jacket only, and the trousers are another $178.
$500 Navy Suit - Page 4
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Now take that $600 total and multiply it by 0.3 to come up with $420 plus tax. The corporate incentive sale is today (Wednesday) only and allows 30% off most purchases, including suits.
Thoughts on BB "Suiting Essentials"?
No personal experience, but SA's have said Suiting Essentials is a step up from the old Brooksease line. I had Brooksease suits a long time ago and they were fine for a starter suit for someone just out of school. FWIW, the Suiting Essentials is the Regent cut.