Vermont does not currently have a Statewide Referral Program.
Here are some links to spay/neuter programs in VT. Please contact them for more information on finding affordable spay/neuter near you.
State Subsidized Program
http://dcf.vermont.gov/esd/vsnip
Vermont Companion Animal Neutering
http://www.vt-can.org/home.php
Middlesex, VT
Franklin County Animal Rescue
http://www.franklincountyhumane.org/spayneuterclinic.htm
St. Albans, VT
Riverside Rescue
http://www.riversideanimalrescue.org/#!low-cost-clinic/c1af1
Lunenburg, VT
Rutland County Humane Society
http://rchsvt.org/2015/08/27/low-cost-cat-spayneuter-clinic-september-28/
Windham County Humane Society
http://www.wchs4pets.org/our-services/spay-and-neuter/
Second Chance Animal Center
http://www.2ndchanceanimalcenter.org/spay_neuter.html
Shaftsbury, VT