I am sure buying them would be just as good, but its always more fun and rewarding to make stuff yourself.
I am not sure what you want runes for, but if you are talking about rune stones like on dungeons and dragons, I would not hold my breath waiting for magical things to happen.
I had a great +5 fire rune stone for my wizard, but that is just fantasy. In real life it would just be a rock, maybe +5 bash on the head or something.

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