the invention provides a method and system capable of allowing users to complete collections of objects without unwanted duplication thereof . the system automatically , and in response to user direction , determines if objects are available that would complete a user &# 39 ; s collection . the system can automatically purchase and obtain delivery of objects identified as being needed to complete a collection . the system allows a user to statically define and derive the parameters of a desired collection of objects and can create , and suggest to the user , collections of which the user already has a portion . the system includes functionality that provides user - definable collections .