single-source

single-sourceverb
Business/transitive usage: to obtain or supply something from only one source.
Definitions
to obtain or supply something from only one source; to rely on a single supplier
The manufacturer single-sources all critical parts from one vendor.
single-sourceadjective
Usually attributive; describes something obtained from, supplied by, or involving only one source.
Definitions
supplied by, obtained from, or involving only one source
The company adopted a single-source supply model for its key components.