Novelty fabric is everywhere! If you want something specific you can google it and a list of places will come up. It depends on what you believe is a "Novelty". I love buying kids fabrics and making the "I Spy" quilts. Christmas fabrics, Thanksgiving and Halloween fabrics call my name too. My niece loves the princess items, my nephew it is Legos and Star Wars. So much fun! If you have fabric at a WallMart near you, check there. I have found that some of the novelty fabric they sell is the same one sold at other places just a lot less.
One of my favorite fabric stores told me they don't carry very much novelty fabric because the quality of the fabric isn't the best. But I am going more for the immediate interest and subject than long term. Even though a few of my quilts have lasted more than 25 years.
Enjoy what you find!