Avila Lighthouse Suites normally checks out the motorized beach wheelchair for free, but unfortunately it is no longer operational. They still check out a manual push beach wheelchair that can be used on Avila Beach. It’s free to check out that chair for a limited time ( ~ 2 hrs).
You can reach Avila Lighthouse Suites at 805-627-1900. You can rent a motorized beach chair from California Coast Power Chair by calling 805-270-5238 or going to their website: rentbeachpowerchair.com. There is a fee for renting it and a delivery fee if you want them to bring it to you at any of the local beaches.