 EAST RUTHERFORD, NJ, March 17, 2021 GLOBE NEWSWIRE -- MamaMancinis Holdings, Inc. OTCQB: MMMB, a marketer of specialty pre-prepared, frozen and refrigerated food products, today announced that it has received new commitments from major retailers, and has begun to ship its previously announced new placements into 60 San Francisco-area Costco locations as well as 100 Sams Club stores in a trial placement. 