Ugly Christmas sweaters are widely available at retail stores such as Target, Walmart, and Old Navy. You can also find a wide variety of unique and one-of-a-kind ugly Christmas sweaters on websites such as Etsy, Amazon, and Redbubble. If you're looking for something more specialized, you can check out websites like UglyChristmasSweater.com or UglyChristmasSweaters.com for a wide selection of festive and funny designs. Finally, if you're looking for something truly unique, you can even make your own ugly Christmas sweater at home with supplies from your local craft store.