Several other useful things to note:
Generally prices for apps are very low $1 - $5, and the updates (as others have said) are free. Even if an app splits in two for a HD version, the cost is still generally low.
You can deploy the apps (and any in-app purchases) on as many iPads, iPhones, or iPod Touchs that you like. For an individual this doesn't really signify, but amounts to big savings for families!
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