Combat Patrol: Space Marines is one of the highest-velocity 40K boxes. Fair value is the recent sealed all-in cluster plus complete used comps for the same edition.
What to match
Box art and contents change across reprints. Always match the listing title and photos to the edition you want before you compare prices.
Sealed vs used
Sealed sets the floor for alerts. Used-on-sprue should discount for risk. Painted armies are a different product. Do not average them into sealed.
Related boxes
Compare Blood Angels, Dark Angels, and Black Templars patrols when chapter look matters more than the generic Marine box. See also Leviathan and the Ultimate Starter Set if you want a dual-force intro.
How much is Combat Patrol Space Marines worth?
Open the live box page for current listings. Set a watch below the sealed middle band so you buy on dips, not hype.