Is it possible to get just a single veneer? How much would that cost?

While it is possible to do one veneer, it is very difficult, especially on a front tooth, to achieve realigning or a perfect match. Typically, we recommend doing at least two veneers. We would recommend visiting an accredited cosmetic dentist for a full evaluation and specific recommendations. Depending on the severity of your cross-bite, you may need to either mechanically move the teeth (braces, Invisalign, retainers), or remove tooth structure from the front tooth (using a veneer) to straighten the tooth. 

Hi, thanks for sending your question.   Although its possible  to place a single veneer, your case would have to be evaluated thoroughly to make sure your goals are achievable. All the best,