For a mega shop - Coronas in Orlando is hard to beat in sheer numbers of cigars - they boast over million sticks. The atmosphere and accompanying attitudes there, however suck.
I prefer nice, much smaller local B & M,s where you are a regular. They have a limited, but quality selection, comfy seats, sports channel and the crowd remembers you by name.
That's Ol Times in Casselberry, FL and Tobacco Locker in North Port Charlotte, FL.