Here are a few websites that may offer you a well made shotgun case;
www.Blackhawk.com www.QMuniforms.com www.PoliceHQ.com www.Galls.com www.Natchezss.com www.5.11tactical.com .
I like the milspec VooDoo tactical shotgun scabbard too but it's not a full case. The bright orange Pelican line has merit.
CF