Amazon deal: 580EX II + PW 801-125 for $539 IR shipped

I was looking at the 580EX II with instant rebate on Amazon.com, and I noticed that if you purchase it with the PocketWizard PWP-TR 801-125 PLUS II Transceiver (Black) you get 10% off the PW ($20 savings).

So the final price is:

$370.00 = 580EXII: $420 - $50 IR
$169.20 = PW 801-125: $188 - 10%
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$539.20 ($68.80 savings)

tax and shipping may apply for some, but none for me (prime + live in CA)