I'm not an instructor( in fact, I've only recently gotten my OW cert.) but, I'll throw out some ideas(that you may or may not have thought of) anyways. You might try calling all the city pools in the area and see if they will work out a deal with you. Also, check out any universities. They sometimes have pools for their P.E. curriculum. Also, check with any larger and newer high schools. Some of the more recently built high schools (at least in the DFW area) have pools for their P.E. courses and swimming and diving teams. Heck, my scuba instructor teaches the pool portion of the course in his back yard swimming pool. It is 9' deep and fairly sizable. Enough to get the pool dives taken care of anyways. This may not be of any use to you, but I hope it helps.