Strange that only the red cover (data) free eBooks are listed. Will the cyan covered books also be available? As a side note, I've noticed OReilly Kindle books

Strange that only the red cover (data) free eBooks are listed. Will the cyan covered books also be available? As a side note, I've noticed OReilly Kindle books on Amazon are subject to dynamic pricing strategies. For example, one book I have in a list fluctuates regularly between $24 and $36 I've haven't purchased a single OReilly book since they removed the option to buy DRM free eBooks directly from their website.