My daughter takes care of 15 feral cats and had them all fixed.
I dont know where she took them but it was very reasonable. She traped them two at a time with special cages.
Since she lives in a rural area with lots of land she enclosed an old porch for them to sleep in. They are fun to watch and they keep the pests at bay.
Right now Im watching a couple of them trying to get at something in a stack of logs outside my window.