You might try the villas at OKW, BWV,or WLV. You may also be able to book at BCV depending on whne the trip is. There are studios that sleep 4 with small refrigerators and a microwave, 1 bedrooms that sleep 4 with full kitchen and laundry facilities and 2 bedrooms that sleep 8 and also have a full kitchen and laundry facilities. OKW also has Grand Villas that sleep 12 and I believe that BWV has some Grand Villas but I'm not positive (don't have my member guide book handy). You can try the DVC rent trade boards. There are always members listing points for rent. They are usually $10 dollars a point but can occassionally be found for less.
Lori