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@moth
Either from a sufficiently friendly bike shop that has some spare, or by buying new bolts with dustcaps, eg: http://www.jejamescycles.co.uk/ml-shimano-type-8mm-allen-key-crank-bolts-id25133.html
Or just don't worry about it until the crank works loose again and you have to replace the arm as well. Maybe you're lucky, but sadly it takes very little time to bugger up cranks when they're loose.
(Also, check the other side is tight too...)