Some things[,] that have a value[,] derive their value from other things.
The first comma seems like it would only be valid if "that" were switched for "which", but obviously "which" feels wrong in this context. The second comma seems to be too strong of a pause in the sentence flow when read aloud but, without it, the subject of the trailing clause "feels" ambiguous. I say "feels", because obviously there is no ambiguity to speak of; rather, without the second comma, the flow of the sentence feels like it places emphasis on the middle part of the sentence rather than the subject.
How should the sentence be punctuated, or alternatively, how should the sentence be rearranged to flow more correctly than it currently does?