What's worse than a buck-a-book Kindle sale? Finding out that they're even cheaper as a set.
Seriously, I looked at two series that are featured in the current sale and found that while they were all $1 each individually, I could get one pair for $1.80 and another for $1.50. No, I'm not talking about collected editions - this is just Amazon saying, "hey, we'll cut you a deal if you buy both."