There is a central district bandmasters association which you might find of value to you. You might be able to contact a band teacher in each of the districts to get a heads up on what/where there might be offerings and decent programs.
Central District Bandmasters Association
In the wake county school system elementary level, there is lots of variety in electives offerings depending on whether or not it is a magnet school. Magnets have more electives and appear to have stronger band offerings. In the middle school, I am not sure if all middles have band or not - but a review of the middle schools in the WCPSS might let you see if band is offered at some or all. It seems that every high school has some sort of band but that may not be true. If you look at the central district band All District band tryout results for 2010, it'll give you a good idea of what high school is sending students to the try outs and which schools are placing their kids in the all-district band and which instrument sections are strong right now. This district is very large, so it gives you a good idea of the bands through central NC.
CDBA All District Scores 2010
Please note: I am a parent of a clarinet player, not a teacher.