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I don't much like the idea of having the images all at the back. Even if you don't have an image for every chapter, I'd still prefer the images spaced through the book. If you don't have one for every chapter you may decide to embed the images at the best possible locations (not necessarily at chapter start).
All-in-all, I would say: Do what is best for the book. Worry about the technicalities (price vs distribution costs) later. You may find, for example, that when it comes down to final production the images can be reduced in file-size quite considerably without losing much in visual quality - or, as you've already suggested, you may find alternative distribution options that alleviate your size concerns.
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