The cost of inlays and onlays can vary depending on factors such as the material used, the complexity of the restoration, and the dentist's location. Generally, inlays and onlays tend to be more expensive than traditional fillings due to their custom fabrication and precise fitting process. However, they are often more cost-effective than dental crowns, which require more extensive tooth reduction. It's recommended to consult your dentist for an accurate cost assessment based on your specific dental needs and circumstances.