There is a Dr. Wallace in the Tuscon AZ area, one of my Dobe clients took his puppy there. I talked to Dr. Wallace myself and was impressed with him. He said he's been doing crops for over 40 years and was highly recommended to my client. I live in the Dallas area so I might be a little far away, but Tuscon AZ might be worth your drive. GOod luck.
Are you planning to show your puppy? Do you realize the time involved with taping, taping, taping and more taping? It is a lot of work and if you are not consistant with it you will end up with a stupid looking dog that has part-way standing ears or one ear up one ear down. A bad crop is worse than a natural ear. Remember you are going to have to look at these ears for life. Not mentioning that some European countries have banned the practice as 'inhumane'.