If feral they do neuter and shots for 50 bucks but you have to call and then bring the cat in a trap.
I do not know what trap neuter kits are but you do need to take them to get them checked for health issues and shots you wouldn't want to get your male 🐈 to get a chance to be with female cat's your 🐈 could possibly get a diseased cat's infection or take them to 🐕 shelter if you don't want to keep them or can't afford to keep regular vet visits for them. Just my opinion. (SMILING ANGEL)
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