New Hampshire does not currently have a Statewide Referral Program.
Here are some links to spay/neuter programs in NH. Please contact them for more information on finding affordable spay/neuter near you.
Quick Fix Clinic
http://www.manchesteranimalshelter.org/programs-services/quick-fix-clinic/
Manchester, NH
Animal Allies
http://animalallies.org/
Manchester, NH
NH Humane Society
http://www.nhhumane.org/snap.php
Laconia, NH
Animal Rescue Veterinarian Services
http://www.arvsonline.org/
Salem Animal Rescue League
Provides resources for many different programs throughout the state, including the state subsidy program
http://www.sarlnh.org/Spay___Neuter.html
Clinton Veterinarian Hospital
http://www.clintonvet.com/spay-neuter.html
Clinton, MA