Do you have an Ace hardware nearby. They're the only ones I've found that carry metrics. Both of ours sadly went out of business, but I bought everything they had before they closed. My lhs has 2-56 bolts as well, which can be used if necessary (you have to change the nuts too). Good luck. You don't really need allens, although they are convenient.

The Hobbytown USA in Atlanta had metrics too, now that I tink about it. Do a search in google and see if you've got one in the area.