Aside from purchasing 2 weeks prior to black Friday, I'd add that it's actually up to the vendors to offer price protection and not the manufacturer.
That being said, most large sales outlets offer price protection, though I must admit... I am rather surprised that B&H doesn't do this myself.
At any rate, I'd first caution against buying from stores that don't offer price protection, and I'd second that with a note that it's best to wait until the passing of major sales events before making your purchase. - live and learn they say.
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Oh and good-luck with your Nikon products. I'm sure you'll be fine with that also. - can't go wrong either way.