The National Oceanic and Atmospheric Administration awarded a $28,035 firm fixed price purchase order to Biomark LLC, doing business as Biomark Inc of Idaho, for 10mm sterile syringe passive integrated transponder tags and hand-held PIT tag readers. The solicitation sought these specific Biomark products as the agency requires their use for internally marking sea turtles as part of research projects managed by NOAA's National Marine Fisheries Service Southwest Fisheries Science Center. Biomark was properly determined to be the sole-source provider of these 10mm PIT tags and universal HPR Lite readers, which are essential for collaborations across research locations and affiliations using various tag types. No other vendors were found capable of meeting the small tag size requirements specified in NOAA's research permits.