In this monograph, the author aims to provide a comprehensive comparative study on modern sales law in the Eastern European and Central Asian states, covering 25 jurisdictions altogether. The paper is based on legislative acts, doctrine and case-studies. Taking into account the significant difficulties in accessing these materials in the English language, the work will serve as a source of information on a number of contract law issues for lawyers worldwide. This research aims to contribute to legal scholarship by providing a comparative-functional approach in the subject area of sales law. The approach taken should be useful for any law practitioner and researcher looking for a detailed and well-supported legal answer to any of the topics covered by this work.