spca (dallas area)"Neuter Scooter for a Nickel,"

via Wendi of dfw blogs:

In an aggressive effort to curb pet overpopulation, the SPCA of
Texas and the Humane Society of the United States' local spay/
neuter clinics are partnering to host "Neuter Scooter for a Nickel,"
an annual campaign in association with Spay Day USA that invites cat
owners to get their male cats fixed for life--for just FIVE CENTS on
Tuesday, February 22nd.

(outside the dfw area I would think it's still worthwhile to check w your local SPCA and/or Humane Soc. to see if they're doing somethinglike this, and when)