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check your local gas stations $1 tool basket. mine has them. you need a metric set(they usually have like .50-12 or 14 i think). i personally don't like cheap sets cause they tend to strip the screws out.
I bought a set of the allen brand folding ones at K-mart for like $10. (There's a metric and standard set of each)
I also have a drawer full of individual ones, but I really like the fold out style.
And for $10? Cheap, man....