If you have a DSW around, we were in there last week and ours had a ton of rain boot options. I live in a college town. Rain boots are big here with the college, high school, and 20 somethings, but they must be the fancy patterned type or the ones made to look like regular boots or shoes. I'm sure it depends on your area of the country though.
Hunter is big, but the "in" ones usually run $90 to $150. We picked up some cute Ralph Lauren ones at DSW for $49. If you want to go the cheap route, the college girls around here head to Target if they aren't going more upscale.