Now, I am sure that the phone book(s) in LA are huge, but have you looked there? You could also look somewhere like www.superpages.com . And don't forget Google's local search .
A brick and mortar store is basically just any store that you can walk into, as opposed to a virtual store. Megastore or mom and pop, both are B&M. The recommendations I made before should help you find both.
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