Does it have to be dry? I'd say that is hard without involving a nut. Would it be that bad to buy some good quality crisps, corn chips (u can buy blue corn chips !) mini poppadums, Indonesian crackers etc as a treat?
Other than that I would suggest olives, manchego, feta, pickled garlic/onions/gherkins, hard boiled eggs, home made salsa dip, pickled ginger, hummus, carrots/celery/cucumber. They are my snacks of choice but don't think pickled garlic is too popular with the oh haha