There are a number of retail shops throughout the city that sell good cuban cigars. That said they are very expensive. I have not found one that will sell wholesale , even if you buy a box , or 3 boxes !! Good question , anyone ??
There is a store on Santa fe and Azcuenaga (on Sta Fe next to the veggie store ) that has been in business for at least 40 yrs, another one on Pueyrredon and Pacheco de Melo ( on Pueyrredon ). Most supermarkets carry cigars ( check around their wines and spirits aisles ). These are the ones that come off the top of my head atm.