One way to get free access to OPT candidates in the USA is to visit LinkedIn, Indeed and websites like OPTnation and OPT Resume. Being part of Facebook groups and Telegram groups designed for OPT students is helpful too. Place job ads on the university’s career website and work with international student offices as well. Setup advanced searches on LinkedIn to find and approach people with an OPT visa. In addition, you can try participating in Reddit’s OPT groups and depend on free online repositories of resumes. Connecting with people from various places will help build a good group of OPT eligible candidates.