The prices in my post are for Washington and British Columbia area. I suspect that prices vary wildly by region.
I have a 40 foot slip now and pay $212 a month plus electricity. In my old 30 foot slip it was $160. When I lived in Seattle a 30 foot slip at the port owned marina was about $250 and at the newest marina it was about $350, but included cable for what thats worth.
If you meant guest moorage when visiting marinas or parks while cruising about, it varies wildly. At a mooring ball in a state park it costs $7 a night or $11 on a dock up to 36 feet. Marina''s I have stayed at have charged me from $11 to $45 for a night at their docks with electricity. Showers usually are about a dollar.
19'' boat, inside slip, no electric or water, $140, and I''m the cheapest slip in the cheapest marina in the harbor. Channel Islands Marina, Channel Islands Harbor, Oxnard, Ca.
Out of the 20 years that I have lived in Annapolis, I only paid for a slip for a year so I am not sure what the going rates are. For the past couple years, I have kept my boat at my house but I have a couple slips that I rent out at the house. I get roughly $1500 per year for a 27 foot slip and $2400 for a 42 foot slip both are well protected. Water and electricity is available but generally is not being used. The 42 foot slip is pretty deep (9-10 feet) and so gets a premium since a boat won''t touch bottom during an extreme low tide.