I store my boat inside for $100 / month. I buy an Annual Pass to launch my boat at the local county park on Lake Travis (Austin, Texas) for $50 / year. I fill up on 93 octane between the storage place and the ramp. I buy ice at the same time that I buy gas.
This is the most cost effective way for me to go boating. I live 5 miles from the ramp, and the storage place and the gas station is "on the way" to the ramp.
Life is good in Central Texas!