Stephen, have you tried some of the doctors listed on the MN Trans Health Coalition web site? You might be able to find one who has a better schedule for you.
http://www.mntranshealth.org/ Several of the doctors listed under "Family Practice Physicians" also prescribe and monitor hormones. Dr. Thorpe, under, OB/GYN, also does, but I can tell you right now she's booked 3 months out. (Unless she's had a cancellation)
Edit: Just wanted to note, in addition to Thorpe, I've heard good things about Dr. Willis, Dr. Bucher, and Dr. Meininger. Meininger is a pediatrician, and usually limits his patients to those under 25. I'll be seeing Bucher on the 30th, so I can give you a first hand account then.
(Admin. - I'm assuming since I'm link staff, I can post links, but if I'm wrong, please let me know.)