Depends on what kind you have. The aftermarket ones are sure to be much cheaper than getting one from Country Coach. While the nomenclature below says "door" that can apply to baggage/bay/basement/entry etc.
Power Door Lock Actuator - Amazon
Rotary Lock Actuator - Veurinks
Veurinks [7144 Division Ave S, Grand Rapids, MI 49548 Phone: (616) 281-5111] bought a lot of shelf stock from various failed RV manufacturers. They have many parts for Monaco and Country Coach. Many door locks used in both brands were furnished by TriMark. The rotary one above is TriMark.
Northwest RV supply, like Veurinks, bought loads of liquidated inventory, [86325 College View Rd, Eugene, OR 97405 Phone: (541) 746-9092] and is another good source for this kind of thing.