Earlier quoted context omitted.
I just checked the official annual budget for all of the penal institutions in Turkey. The 2022 budget is 3.2 Billion Liras[1] ($180M) for about 300.000 inmates in total. Dividing, you get about $600 per inmate per year! (and honestly it doesn't even sound that absurd considering the low cost of living here) [1]: https://www.sbb.gov.tr/wp-content/uploads/2021/10/2022_Yili_...
Incredible. Almost all of the money saved could be either returned to the taxpayer, or used to build houses for the poor on the 127 prison sites.
And if reducing costs is your only goal. Well there are other options to get rid of criminals..
Or you could just them as free labor to build those house for the poor.