With insurance, my HRT meds are a few bucks each month. Endo and lab visits (every six months, although every three for the first year) were covered by insurance - the endo was kind enough to "pretend" than I was seeing him for something non-trans, and the insurance company didn't complain once even though it technically excludes trans-related care.
So with insurance, four visits, labs, plus meds would likely total around $500 for the entire year.
Without insurance, it would be a different story. The meds would still be cheap because they're all available as $9 generics, but the visits to the doctor and particularly the lab tests would have pushed this cost up to many thousands of dollars. I'd gladly have paid out of pocket for everything though, because the effects the medication have on my well-being are priceless.