Lotsa Pasta has Minor's Lobster Base. It is in the frozen section. I haven't used the lobster base but use many other bases by Minor's and found them good. May be worth a call before you go to make sure they still stock it.
I'd love to see you give Lotsa Pasta some business, but for what it's worth, you might call Party Source at Springhurst, which would be closer to you. They definitely carry Minor's bases, but I don't know about lobster.