Too bad I don't still work for the sign shop, or I could get you a great deal. I helped out UNCJigga once on something similar. Our sign shop did what they called Ad Specialties, so you may want to give a couple of places around you a call to see if they do the same. We had something like 400,000+ products, with plenty of options for USB flash drives to put logos on.
If you do find a local sign shop that does this, remember that you can always haggle with stuff like this. Our markup was somewhere around 30-40%, so depending on the price, you could immediately ask for a $0.05 to $0.10 discount per unit, which would save you quite a bit for the quantity that you're asking for. It's not like they'll turn you down for business when they can still make money from you. Good luck.
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