Tsawwassen Boat Launch. Free everything. Really rough road to get there. Don't even attempt to launch at low tide unless you have a car topper.
If coming down 17 you have to do a left at Tsawwassen Dr. (the light after 52nd).
It's a rough road.
Recently upgraded to allow 2 boats to launch. As there is no pay parking in Delta, parking is free, launching is free. No overnight parking in the lots.