I’m frustrated

iOS Sensor Programming Dilemma

Do I buy the Rough Cut of the full collection ?
Do I get access to the ebook after it is published ?

Or do I buy the currently published pieces like Basic Sensors in iOS and iOS Sensor Apps with Arduino ?
If I buy the pieces, is there an "upgrade" path to the full collection ?

Why do they have these special sales on SUNDAY when you cannot phone up customer support to ask these questions ?
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