There are all manner of Kinkade Christmas products, including illustrations, ceramic villages made up of individual houses, plates, and an endless variety of other products. No one could ever acquire them all.
Most Kinkade xmas products are found online now. He has a website your mom can go to. He also has a catalog of products that comes out every few months, right around holiday time. I think the catalogs are free. You can also check specialty stores like Pier One exports.