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For those outside SA i have found a very good, affordable travel guide to Kruger
Globetrotter Travel Guide, Kruger National Park
DR L.E.O. Braack
Revised by Keri Harvey 2011
ISBN 978 1 84773 897 4

Very nice info about the history, camps, roads, animals etc.
Small enough to slip in a backpack.
With a very good map (from MAP studio)
Payed 11 euros.

I collect all Kruger guides from L.E.O. Braack, because they are very informative, with few mistakes if any.