There are a few various types of bone which are available for burying. The process of collecting regular bones and then burying them is time consuming, so some Runescape Gold players would rather buy the bones, but even just the process of burying the bones would take a quite awhile. This is why big and dragon bones (dragon bones are only available to members) are considered the best when it comes to training prayer. Big bones give approximately 15 up (each big bone buried equals to around 31/2 regular bones) and can be obtained by all giants. For this reason, big bones are valuable and are priced at about 300-450gps each. For members, dragon bones, which are much more valuable than big bones, are priced at more than 2k a piece, and can give a player approximately 72 prayer exp each.