I use Motor Minders to store my boat. They are a bit different to other car/boat storage places in that you can't actually just go in and get your boat out yourself. This has its pluses and minuses. On the plus side it means no one else is reversing their boat trailer around your boat, but on the downside it means you have to contact them in advance and tell them exactly when you're going to pickup or drop-off. Pricing is probably pretty typical these days as storage prices in general have gone up.

Approximate cost: $220 per month