The Ultimate Collector's Series, or UCS, is a LEGO subtheme of Star Wars introduced in 2000 and was meant to be more detailed and aimed at older builders. These Ultimate Collector's Series sets tend to be larger, and more expensive than typical sets.
Ultimate Collector Series currently consists of 38 sets that as of now has run from 2000 to 2023. As of today,
10018 Darth Maul is the most valuable Ultimate Collector Series set with an estimated new/factory sealed value of $3,306.
Summary
Star Wars Ultimate Collector Series Death Star II set 10143 was released in September 2005, retailing for $270, but has since been retired. New, unopened Death Star II sets are valued at $3,099, while used sets can be found for $1,150.
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