There are a number of Commercial Liquid Yeast Suppliers. Below are the most well known, when they were founded, the number of strains they carry, and their Google Rating.
Bootleg Biology
Founded 2013 | 30+ Yeast / Bacteria Strains | Nashville, TN
Brewing Science Institute
Founded 1996 | 100+ Yeast / Bacteria Strains | Woodland Park, CO
Imperial Yeast
Founded 2014 | 50+ Yeast / Bacteria Strains | Portland, OR
Inland Island Yeast
Founded 2014 | 100+ Yeast / Bacteria Strains | Denver, CO
Omega Yeast
Founded 2010’s | 100+ Yeast / Bacteria Strains | Chicago, IL
Propagate Lab
Founded 2018 | 100+ Yeast / Bacteria Strains | Golden, CO
White Labs
Founded 1995 | 200+ Yeast / Bacteria Strains | San Diego, CA
Wyeast
Founded 1986 | 100+ Yeast / Bacteria Strains | Hood River, OR