Find gyms in your area where independent trainers work and look for someone with a background in what you're interested in. Then contact them and be up front about what you're looking for. Commercial gyms probably aren't going to work for you and probably don't have anyone you'd want to work with anyway, so look at private, semi-private, and warehouse gym types of places.
Where do you live? Its unlikely, but maybe someone here could give you a specific recommendation.