David Liptak's compostions are available from the publisher or distribution services. Online sales of print or pdf copies are the easiest way to obtain scores, and ensemble music parts are available for sale or rental from the publisher. Publisher and distributer pages are found below, and you can link directly to his catalog by clicking the links. In addition to these, there are more options for purchasing the music directly from music outlets or from large internet sales sites like sheetmusicplus.com.
For more information about individual works, links to the category pages (solo, duo, etc.) will take you to a more detailed listing of the works in the category with links to publishers, distributors, and recording sites.