For the ferals we TNR, I know they charge us 50% - I just didn't know what it was. They don't charge us to board them when they TNR them - and they do keep them 24 hours (or more, if necessary). They don't give us 50% on spays/neuters - but they do give us a discount. Honestly, I have no idea what we pay for it. We just keep a running bill and pay something every month or every other month. We haven't been trapping in a long time, so we have a credit balance. But it's usually a debit one!
I don't even want to think about what we've paid to keep Tuxie alive. He was in for a nupogen shot every day for months, an epogen shot every other day for months, a hematocrit every week for 6 months, every other week for another 6 months, every month for a year, every 6 - 8 - 12 weeks for another two years - and depo shots initially every week, then every two weeks, then every month, then every 6 - 8 weeks - and this was for three years. Not to mention all the other meds inbetween and the blood transfusion, the stay at the hospital with the IV fluids, the second attempted blood transfusion... and all the testing that was done to figure out what the hell he was sick with. Oh, and of course the MRI because of his enlarged heart and spleen.... not to mention the several times he got blocked.... and that's just Tuxedo!