I agree with Twin Stars. Using Priceline, you can get a 3* (Hotwire calls them 3.5, priceline calls the same hotels 3*) for somewhere in the range of $28-38 per night. The hotels you will get include the Hyatt, Sheraton, Renaissance, etc. There is a full list available at
www.biddingfortravel.com. All the 3* hotels have a free shuttle to and from the airport. Obviously, if the name of the hotel matters to you, don't get it this way.....
I would caution you NOT to go to the 2.5 category on Priceline. There is a very nasty LaQuinta at that level, so the only way to avoid the nasty place is to not bid the level.
ALternatively, you can take a limo to the port/Cocoa Beach area. Again, Priceline has Hilton, Holiday Inn, and Doubletree available at the port. It is $3 to take a shuttle to the port in the morning from these hotels. The Radisson at the port has a free shuttle. You do need shuttle reservations made in advance.
We find that there is plenty of time on Sat. morning to get to the port, so usually stay in the airport area....but either way will work. It depends on what time you get in and how tired you are....