ICES is a good place to start, as is the local continuing education programs (where I teach) and local colleges. Local cake decorating stores also will include cookie classes in their Fall lineups. I highly doubt Michaels, Hobby Lobby or JoAnn's will have a cookie class anytime soon, but if they do it will most likely be a Wilton class as they have the corporate agreement. Then there's always private lessons too, if you find a decorator you like. Hope that helps some!