Outside of Hawaii Jackfruit is not all that common in the continental U.S. If you live in an area with a large Asian population you can probably find it in an Asian grocery store.
Almost every part of the entire jackfruit plant can be used. According to Cropsview.com "The latex of the tree is used as bird lime. If heated, it makes an excellent cement for broken China. The bark has been made into rope and cloth." The tree wood is a medium-hardwood so it can be used for making furniture, bowls and even for construction.