Rentalo.com currently has Florida vacation rentals — villas, apartments, and condos — that sleep as many as eight people for $100 a night or less. An example: Samantha’s Castle in Orlando is more like a house than a castle, but then it costs but $85 a night. It has three bedrooms, two baths, a formal dining room, an open kitchen, a deck, and a built-in heated pool. It’s 6 miles from Walt Disney World. A stay of at least three nights is required.