I am a tretired Pharmacist...live in your area, and to be honest I do
not think any of these chains actually whearhouse this class of drugs
in their own whearhouse...just too expensive to have to deal with
government regulations on storage and transfer of these drugs..so most
of them buy from a local Drug Wholesaler..and there are not a lot of
drug wholesalers that serve Northern Virginia...and I do not know of a
single chain that deals with more then a single wholesaler...So even
finding Mallinckrots brand may not be easy...as drug wholesalers like
any other business do not normally carry the same thing made by 3 or 4
suppliers...
 
That said... The thing that we as pharmacists are faced with is the
plain fact that Insurance compaqnies pay us using a method of Maximum
allowable cost ...plus a dispensing fee of a few bucks and if the
Mall's actual cost is more then this Maximum Cost they reimburse us
for we eat the difference (take a financial loss)... Add that with the
fact that these drugs are treated like narcotics with all the
inventory controls and paper work the pharmacy has to endure not many
"Drug Stores" are willing to ...work harder.. increase their own
inventory  by duplicating stock ..and then loose money ...

Bob