Uniform store or a place to buy scrubs?

I need to buy a few pairs of white uniform-type pants- I'm envisioning cheapy, baggy drawstring cotton pants. While I've never worn or bought scrubs, I assume they are the cheapest option for pants like this...anyone know of a place with a decent selection of scrub bottoms for the cheap? I don't *think* there's any place in the neighborhood, so anywhere around here would be nice but the union sq area is also an option...