Cheap, Bulk Hats and Gloves

My family volunteers with a homeless program in Houston, and at Christmas, we like to give out hats, gloves, sweatshirts, and socks to the men and women that come to the soup kitchen we work with. My parents are providing the hats and gloves this year, and they're having trouble finding a cheap source that will allow them to choose all one color - we try to avoid color selection because of gang affiliations, so in the past all of this stuff has been black.

Do you know of any good, cheap sources for one-size-fits-most hats and gloves? I'm talking the kind they sell at big-box stores as 2 for $1.50. I know it's not typically frugal, but for this application it works well - they only use them for a few months before they're typically discarded because it's too warm to carry them around.