The sale of fossils on the international market is absolutely legal. However, some specimens have historical and cultural value. Therefore, it is necessary to do an examination. If the examination recognizes that the fossil has museum value, then you will be offered a fee. In most cases, valuable fossils are in private collections and are not sold. You can buy the fossil at auction from a private collection. Fossils are very expensive if they are rare. However, you can buy fossils and inexpensive. If the fossil is found on a private territory, for example, in the USA, then it can be freely bought and sold. As a rule, fossils are bought around the world without restrictions. But if there are restrictions on the sale of fossils, then the seller must warn you about this.