Is the following sentence acceptable?
(1) I'm planning to buy a single-lens reflex camera, but it will cost me a lot.
(2) So I have to live a frugal life to save enough money to buy one.
Yes, I believe both sentences are acceptable. They are grammatically correct.
As a native speaker, I might change the second sentence to one of the following:
1. "So I have to be frugal to save enough money to buy one." (first choice) or
2. "So I have to live frugally to save enough money to buy one."
Saying that you "have to live a frugal life" sounds a little strange to me. It sounds a bit like you have to live frugally for the rest of your life and not just for a short period while you save for a camera.
Teaching ESL to Adults