Can't speak of off sight places but maybe someone will come along and chime in. As for on sight options, you'd be looking at either the FW Cabins which will accommodate 6 with a bedroom that sleeps 4 with a double (or queen - sorry not sure) and a set of bunk beds, a murphy bed in the living room, full kitchen and deck outside but only 1 bathroom. OR a 2bdrm villa at any of the DVC resorts will sleep 8 with a king bed in the master bdrm, a sleeper sofa in the living room and a 2nd bdrm with either 2 queen beds or a queen bed and another sleeper sofa - these will have full kitchens,living rooms,in room laundry and a jacuzzi tub in the master bath with another bathroom off the 2nd bdrm and a balcony. There are also 3bdrm GV's available through DVC but availability will be hard to come by.
Your least expensive options for DVC villa are to rent points from a member -- hop over to the DVC Rent/Trade board here on the Dis if interested but you can book through CRO it will just cost much more.
Beyond that, you can book suites at lots of the WDW resorts but they won't have kitchen facilities.
Off sight options with kitchens would probably cost less...but I am a DVC member and always stay onsight so can't help too much there.
HTH's some.