Santa - how much does it cost to send a letter to santa monica from san deigo?

how much does it cost to send a letter to santa monica from san deigo?

i live in rancho santa fe and i want to send a letter to my friend in santa monica how much would that cost?

.42 It would only cost more if it is heavy, or if you want another service, like return reciept, certified delivery, delivery confirmation, etc.
as much as a stamp costs.
It's a normal stamp