Costco Wholesale March Comparable Sales Rise 7.7%; Reports Net Sales Of $23.48B For The Retail Month Of March, Up 9.4% Y/YBy legume / April 11, 2024 / Costco Costco Wholesale March Comparable Sales Rise 7.7%; Reports Net Sales Of $23.48B For The Retail Month Of March, Up 9.4% Y/Y.