well so far I have found one school about a hour from me. $8000 for a 8 week course OUCH!
If you're serious about learning, consider Heartland Horseshoeing School in Lamar, Missouri. The owner, Chris Gregory, is probably one of the best farriers and farriery educators in the country. At $4,600 for the eight week course, it's a LOT less expensive than your more local school. Lodging in the school bunkhouse is included in that price so no hotel/motel costs. Practical Farrier Course | Heartland Horseshoeing School
Just a word of warning. Chris sets the bar extremely high and the coursework is brutal in terms of daily workload. Comparing it to military bootcamp is reasonable.
Your current farriery costs and scheduling suggest to me that your being taken to the proverbial cleaners. While $75 first service cost may be reasonable in cases of extreme neglect, a client shouldn't expect this to be the norm. A 4 week maintenance schedule for trims is unnecessarily excessive. The vast majority of horses do very well on a 6-8 week schedule.
Three horses, at $50 each, every 4 weeks means a total cost of $1,800 per year. The same number of horses done every 6 weeks would drop your annual costs to $1,300. That represents annual savings of 27%.
Were you to enroll in a farrier course at $4,600, it will require 3.5 years for you to recover that investment and you will save $13,000 over the following ten years. You'll also have the skills to do more than just a trim should a horse need it.
Typical horses managed in my business, trimmed on a 6 to 8 week schedule....
Typical neglect case...