Here TNR programs are mostly publicly funded-people just don't realize it because the money is run through nonprofits.  It will always be cheaper to use TNR than trap and kill, with or without the volunteer help.  The numbers are from HHS which traps and kills, and rescues which conduct TNR.  Then when you think about how much is being spent to expand HHS's death camps because they have caused such a population boom, and the increase in the cost of their contract, the numbers skyrocket.