Xouie
Crowing
how much is it?
The most basic, still air, manual turning model is 50$ at tractor supply
https://www.tractorsupply.com/tsc/product/little-giant-still-air-incubator
A caveat — You’ll save money but there will be work in maintaining air flow and turning the eggs.
(Like @Banty crazy, I’m a Brinsea devotee. It’s not a budget brand, but the reliability and ease of use are beyond compare.)
another thought: if this will be a one-time or infrequent thing, do you know anybody near you who can lend you an incubator? Some people also offer hatching services on Craigslist.

I'm glad you found your own method!