Here is the thing nobody explains properly. The commercial pilot course itself — the maneuvers, the chandelles and lazy eights, the complex aircraft time, the checkride preparation — is a matter of weeks. That is not the expensive part.
The expensive part is FAR 61.129, which requires 250 total flight hours before you can take the checkride. A private certificate gets you a fraction of the way there. An instrument rating adds more. The rest is time you have to go out and fly, and that is why a career program is priced as a program rather than assembled from receipts.
Our zero-to-airline program is $89,000. It covers the private certificate, the instrument rating, the commercial certificate, the multi-engine rating and the flight instructor certificate, and the price is fixed on the day you enroll. If you would rather buy the stages separately, the private pilot programs start at $10,900 and the instrument rating is $11,700.
Enrolled students fly single-engine aircraft at $179 an hour wet, which is the package rate the whole program is built from and the reason a fixed career price is possible at all.