<font color='#000000'>Buying at "cost" wouldn't likely save much if you only purchased a couple items. B&M stores get good pricing by buying in quantity.
You don't mention, either, what you hope to buy. Many manufacturers allow only so many dealers in an area, and some require that you agree not to carry certain brands if you want to carry theirs. For example, a local dealer here was told he couldn't keep his authorized dealer status for B&W speakers and keep his Monitor Audio line in the store (he could see them but not display them).
That may work with some brands (VMPS has many 'part time' dealers that work by appointment out of their homes- but I think you'd better impress Big B!), but I don't see many advantages to your scheme unless you can actually sell to someone besides yourself.</font>