How much does a head gasket cost

https://repairpal.com/estimator It may or may not be in the Estimator tool -- Other than that, the only "real" estimates you will get are from shops near you. Here are some close to you -- at this link: https://repairpal.com/repair-shops/toyota-repair-and-service-in-augusta-georgia

Head gasket failure diagnosis should be ‘proven’ before proceeding.