So many marinas around here are half-empty during the winter, you could probably negotiate a good rate for a place that's normally exorbitant during the summer.
In fact, we know of a really nice, newly rebuilt slip at Port Annapolis
whose longterm tenants are headed south this winter (us). We could ask our marina what kind of deal they could cut on a sub-lease, if you're interested. Slip is normally $900/mo plus $100 flat-rate utilities for liveaboard. We could even make a side deal for our DSL service.