The National Institute of Standards and Technology (NIST) seeks an integrated superconducting magnet power system to replace a failed unit in its ultra-low-temperature scanning probe facility, critical for quantum metrology experiments. The required system must be an exact replica of the Cryomagnetics model 4G-200s, with specific technical specifications including ±200 ampere output and compatibility with existing LabView code. This is a sources sought notice to identify potential commercial alternatives; if none are found, NIST intends to award a sole-source contract to Cryomagnetics, Inc. in Oak Ridge, Tennessee. No budget amount or submission timeline is specified in the notice. Performance of services will occur at NIST’s Physical Measurement Laboratory location.