OMG! We love Marathon maybe more than KW. Stay there sometimes for the fishing and diving. What an easy place. Is the Tiki Bar still there? That place can be as much fun as KW sometimes!
we stay at Marerros guest mansion...they have several rooms that are $130 a night. And while its off season...ALL of KW has figured out the poker run is big biz...so high season rates apply everywhere....even B&B's
My wife and I are going down in late February and I just booked a B&B for $150 plus tax, it is number 11 rated on tripadvisor. All of the reviews are great and it is only 1/2 block from Duval Street. It has off street parking. I hope it is as nice as it sounds. http://www.keywestjasminehouse.com/ every thing else is $400 +/-. I hope this helps.