Only one sentence of my full quote was taken, and is a bit out of context. Here it is in its entirety.
It looks like this was indeed a price mistake; Amazon was mistakenly applying the current instant rebate amount on top of their already discounted price. They still have this price mistake active for the 60D and 60D + 18-135 kits.
Good news is, some people have been telling me their order shipped at the low price, so they're probably honoring it. If your order gets cancelled, let me know.
Seeing as Amazon has already shipped a bunch at that price (including mine!), I doubt they will make any cancellations.