Well, wouldn't say, screwed by Nikon but more or less, screwed by B&H.
Now of course, I can't go on an A vs B comparison here, but a lot of times, we the Unique Photo's and B&H's of the world are made aware of rebates continuing past there original dates, or let go past that date.
There have been times that we know of something going on and will inform the customer of the possibilities of a rebate, or being many of us are photographers, share a hunch as to what is coming in the future which may lead to rebates.
Can we blame Nikon, B&H or anyone for this fiasco. No, can we blame you? Of course not. It is sadly a sad state of affairs, it is hard for a company like B&H or Nikon *unique as well at times* to say, "oh yeah, here is some more money, we feel bad about this". If your salesman at B&H knew about it, you would think he would let your order go to the next day. Or the Nikon rep as you said realizing your a Nikon user and are loyal and how for the simplest way he can make a customer very very happy and appreciative and come back for more products.
I will admit, even I have been put in the position of rebates coming or going within a 24 hour span, and sometimes I do my best to give the customer everything they can deserve. However, keep in mind, I had roughly 5 customers all come back and yell at me at CF prices. I sell a card in January for $169, the fact it dropps down to $99.95 in July doesn't mean I can refund them the difference. Its the sad world of the then and the now, I don't like it but sometimes you the manufacturer or you the vendor have your hands tied and can't do anything and the customer in the end has to "Shine on" and "chin up".
I feel bad when that happens and often down the road I might do something to try to cosmically balance things out for the customer I might not normally have done.
I hope the photo karma eventually gets back to you on this one, its a sad state of affairs when things like this happen. But even with those Nikon Rebates, the Winter Rebate is the one your mentioning, there is a fall rebate, did they give you that one at least?
Glorified Unique Photo Counterboy